Power measurement device and power measurement system

Abstract

To provide a power measurement device and a power measurement system using the power measurement device.SOLUTION: A power measurement device measures the power flowing through a first power line using a first current transformer. The power measurement device includes: a first both-wave double-voltage rectifier circuit that is connected to the output of the first current transformer; a first load resistor that is connected in parallel to one output side of the first both-wave double-voltage rectifier circuit; a second load resistor that is connected in parallel to the other output side of the first both-wave double-voltage rectifier circuit; a first control unit that controls switching of ON / OFF of the first switch element connected to the first load resistor and a second switch element connected to the second load resistor; a first measurement unit that measures the potential at one end of the first load resistor and at one end of the second load resistor when the first switch element and the second switch element are turned on and obtains a current value; and a power storage unit that is connected to the first both-wave double-voltage rectifier circuit, and is operated by the power from the power storage unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a clamp-type, non-contact, non-power-supplying power measuring device that can accurately measure the amount of current and does not require any installation work, and to a power measuring system that uses the power measuring device. [Background technology]

[0002] Non-contact power measurement devices that can be installed without construction by clamping to a power line and measuring the amount of current supplied to an electrical load via the power line are becoming widespread (Patent Document 1, etc.). Attempts are being made to use such power measurement devices to sequentially measure the amount of power consumed by electrical loads in homes and facilities, detect power surpluses and deficiencies, detect abnormalities, and realize energy management that monitors whether power consumption is appropriate.

[0003] Many non-contact power measuring devices use a current transformer with a winding wound around a core that conforms to the shape of the clamp that clamps the power line to be measured. Such clamp-type non-contact power measuring devices that do not require a construction license require a power source for their own operation, and many have been proposed that incorporate small batteries. To prevent the small batteries from becoming unusable when their lifespan runs out, some non-contact power measuring devices obtain power from the output of a current transformer, realizing a power-free operation, as disclosed in Patent Document 1 and other documents. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-039680 A Summary of the Invention [Problem to be solved by the invention]

[0005] Since non-contact, non-powered power measuring devices obtain their own power from the output of a current transformer, it is not easy to directly obtain waveform information of the input current to the current transformer, which may reduce the accuracy of the active power measurement results.

[0006] An object of the present disclosure is to provide a non-contact, non-powered power measuring device that requires no construction and can accurately measure the amount of power, and a power measuring system that uses the power measuring device. [Means for solving the problem]

[0007] According to an embodiment of the present disclosure, a power measurement device measures power flowing through a first power line using a first current transformer, and includes a first full-wave voltage doubler rectifier circuit connected to an output of the first current transformer, a first load resistor connected in parallel to one output side of the first full-wave voltage doubler rectifier circuit, a second load resistor connected in parallel to the other output side of the first full-wave voltage doubler rectifier circuit, a first control unit that controls the on / off switching of a first switch element connected to the first load resistor and a second switch element connected to the second load resistor, a first measurement unit that measures potentials at one end of the first load resistor and one end of the second load resistor when the first switch element and the second switch element are turned on, and determines a current value, and a storage unit connected to the first full-wave voltage doubler rectifier circuit, and the first control unit and the first measurement unit operate using power from the storage unit. Effect of the Invention

[0008] According to the present disclosure, by using a full-wave voltage doubler rectifier circuit, even if power for operation is obtained, it is possible to reproduce the current waveform in the power line to be measured from each of the positive and negative outputs. Power can be obtained even with a small current by using a full-wave voltage doubler rectifier circuit. Since the current waveform can be reproduced, the amount of power can be measured with high accuracy even without contact and power supply. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is a schematic diagram of a power measurement device used in a switchboard. [Diagram 2] FIG. 2 is a block diagram showing a configuration of a power measuring device. [Diagram 3] FIG. 4 is a diagram illustrating an outline of the operation of a first measuring unit. [Figure 4] FIG. 13 is a block diagram showing the configuration of a power measuring device according to a second embodiment. [Diagram 5] FIG. 13 is a schematic diagram of a power measuring device according to a third embodiment. [Figure 6] FIG. 13 is a block diagram showing the configuration of a power measuring device according to a third embodiment. [Figure 7] FIG. 13 is a block diagram showing the configuration of a power measuring device according to a fourth embodiment. [Figure 8] 1 is a schematic diagram of a power measurement system using a power measurement device. [Figure 9] FIG. 2 is a block diagram showing a configuration of a power measuring device. [Figure 10] FIG. 2 is a block diagram showing a configuration of a server device. [Figure 11] FIG. 2 is a block diagram showing a configuration of an information terminal device. [Figure 12] 1 is a flowchart illustrating an example of a processing procedure in the power measurement system. [Figure 13] FIG. 11 is a diagram showing an example of graphic data provided by a server device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present disclosure will be specifically described with reference to the drawings showing the embodiments thereof.

[0011] (First embodiment) FIG. 1 is a schematic diagram of a power measuring device 1 used in a switchboard. The power measuring device 1 is used, for example, in a switchboard in which a power line L1 to be measured is arranged. The power measuring device 1 includes a main body 10 and a clamp body 11. The main body 10 houses a circuit in a rectangular parallelepiped case and is connected to the clamp body 11 via a cable 13. The main body 10 exposes an output section 109 that is a liquid crystal display. The clamp body 11 houses a core of a current transformer in a circular ring-shaped case. The cable 13 houses and covers a winding wound around the current transformer and a conductor connected to the circuit in the main body 10.

[0012] The power measuring device 1 is used by attaching the clamp body 11 onto the coating of the power line L1. It is configured so that if a current is supplied to the power line L1, power is stored in a power storage unit built into the main body 10. This allows the power measuring device 1 to perform power measurement using power from the power storage unit even if it is not electrically connected to a power source.

[0013] FIG. 2 is a block diagram showing the configuration of the power measuring device 1. The power measuring device 1 includes a current transformer 110 housed in a clamp body 11. In the power measuring device 1, a first full-wave voltage doubler rectifier circuit 101 is mounted on a board housed in a main body 10. Of the two outputs of the first full-wave voltage doubler rectifier circuit 101, a first load resistor 102 is connected in parallel to the positive output. A first switch element 104 is connected between the first load resistor 102 and the negative output of the first full-wave voltage doubler rectifier circuit 101. A second load resistor 103 is connected in parallel to the negative output of the first full-wave voltage doubler rectifier circuit 101. A second switch element 105 is connected between the second load resistor 103 and a ground voltage.

[0014] The substrate of the main body 10 is provided with a first control unit 106 that controls the on / off switching of the first switch element 104 and the second switch element 105.

[0015] The board of the main body 10 is provided with a first measuring unit 107 that measures active power based on the voltage (Vo1P) of the first load resistor 102 and the voltage (Vo1M) of the second load resistor 103. The first measuring unit 107 measures the potential of one end (indicated as Vo1P in FIG. 2) of the first load resistor 102 and one end (indicated as Vo1M in FIG. 2) of the second load resistor 103, that is, the voltage with respect to the ground, when the first control unit 106 turns on the first switch element 104 and the second switch element 105. The on-resistance of the first switch element 104 and the second switch element 105 can be calculated from the resistance values ​​of the first load resistor 102 and the second load resistor 103, that is, the current flowing through the first load resistor 102 and the second load resistor 103, that is, the current flowing through the current transformer. A specific calculation method will be described later.

[0016] The first measurement unit 107 is a microcontroller. The first measurement unit 107 includes a CPU (Central Processing Unit), a memory, an A / D converter, etc., and executes a process of measuring a voltage input by the A / D converter and reproducing and calculating a current based on a program stored in the memory. The first measurement unit 107 executes a process of subtracting a multiple of the input voltage (Vo1P) of the first load resistor 102 and the input voltage (Vo1M) of the second load resistor 103 from the latter (see FIG. 3). As a result, the first measurement unit 107 can reproduce a current waveform obtained by the current transformer 110 and calculate an active power using a phase and a predetermined voltage waveform (predetermined sine wave).

[0017] The first measurement unit 107 uses a phase measurement unit (not shown) that measures the phase of the voltage in the current transformer 110, and calculates the active power value using the measured phase. As an example, the phase measurement unit includes an electric field probe for measuring the voltage phase that detects the voltage due to electrostatic induction in the power line L1, and calculates not only the apparent power value but also the active power value. The voltage waveform of the power line L1 to be measured may be a sine wave, and its amplitude may be considered to be constant, such as 100 V. Therefore, if the first measurement unit 107 can measure the phase of the voltage waveform, it can also accurately measure the power value.

[0018] The first control unit 106 and the first measuring unit 107 may be implemented as functions of a single processing unit (microcontroller).

[0019] The first full-wave voltage doubler rectifier circuit 101 is connected to a power storage unit 108. The power storage unit 108 includes a constant voltage circuit 182 connected to the positive output of the first full-wave voltage doubler rectifier circuit 101 via a backflow prevention diode 181, and a capacitor 183 connected to the output of the constant voltage circuit 182. The first control unit 106, the first measurement unit 107, and each of the other circuits described below are operated by the power stored in the capacitor 183.

[0020] The output unit 109 is connected to the first measurement unit 107. The output unit 109 is a liquid crystal display, a seven-segment display, or the like. The output unit 109 is disposed on the surface of the main body 10. While the first measurement unit 107 is supplied with power from the power storage unit 108 and is activated, the first measurement unit 107 outputs to the output unit 109 a value of active power calculated using a voltage sampled by the A / D converter at a predetermined sampling period. This allows a user of the power measuring device 1 to visually recognize the power.

[0021] FIG. 3 is an operation overview diagram of the first measurement unit 107. FIG. 3 shows a circuit for obtaining a current flowing through the current transformer 110 while ignoring other circuits when attached to a power line to be measured. Since a load resistor is connected to both ends of the current transformer 110, the current flowing through the current transformer 110 can be calculated from the voltage VoB across the load resistor. In the first embodiment, the first full-wave voltage doubler rectifier circuit 101 is used, and it is possible to obtain power in the power storage unit 108 even with a small current. In addition, by using the first full-wave voltage doubler rectifier circuit 101, the two outputs are divided into Vo1M indicating a negative current amplitude and Vo1P indicating a positive current amplitude. As shown in FIG. 3, both Vo1M and Vo1P have positive values, so that the A / D converter built into the first measurement unit 107 only needs to input positive values, and an inexpensive microcontroller with a single power supply can be used. The first measuring unit 107 converts these amplitudes into digital values ​​using an A / D converter, and then performs a calculation process called Vo1P-2×Vo1M to obtain waveform data that oscillates in both positive and negative directions. This allows the first measuring unit 107 to reproduce and calculate the waveform of the current generated in the current transformer 110, such as the waveform Vo1a. This makes it possible to calculate the active power with high accuracy.

[0022] The configuration of the power measurement device 1 of the first embodiment allows operation with the configuration of the power storage unit 108 without the need to prepare positive and negative power sources for measuring the voltage across the current transformer 110. In the configuration of the power measurement device 1 of the first embodiment, unlike bridge rectification or half-wave rectification circuits, the circuit using the first full-wave voltage doubler rectifier circuit 101 doubles the voltage after rectification and increases the input voltage to the constant voltage circuit, so that sufficient power can be obtained in the power storage unit 108 even if the amount of current flowing through the power line to be measured is small. From the output from the first full-wave voltage doubler rectifier circuit 101, the waveform of the current obtained in the current transformer 110 can be reproduced as shown in FIG. 3.

[0023] Second embodiment 4 is a block diagram showing the configuration of the power measurement device 1 of the second embodiment. The configuration of the power measurement device 1 of the second embodiment is similar to the configuration of the power measurement device 1 of the first embodiment, except for the configuration of the power storage unit 108, so the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

[0024] 4, the power storage unit 108 of the power measurement device 1 in the second embodiment includes a half-wave voltage doubler rectifier circuit 184 connected to a node between the output of the current transformer 110 and the input of the first full-wave voltage doubler rectifier circuit 101, and to the output of the first full-wave voltage doubler rectifier circuit 101. The power storage unit 108 is configured by connecting a capacitor 183 to the output of the half-wave voltage doubler rectifier circuit 184. The half-wave voltage doubler rectifier circuit 184 may be configured in multiple stages to further boost the voltage.

[0025] By using the half-wave voltage doubler rectifier circuit 184 of the second embodiment, the rectified voltage can be boosted, and sufficient power can be obtained in the power storage unit 108 even if the amount of current flowing through the power line to be measured is even smaller.

[0026] Third embodiment FIG. 5 is a schematic diagram of the power measurement device 2 of the third embodiment. The power measurement device 2 of the third embodiment uses two current transformers and measures the total power supplied from two power lines. The power measurement device 2 of the third embodiment includes a main body 20, a first clamp body 21, and a second clamp body 22. The main body 20 houses a circuit in a rectangular parallelepiped case and is connected to the first clamp body 21 and the second clamp body 22 via a cable 23. The main body 20 exposes an output section 209 that is a liquid crystal display. The first clamp body 21 and the second clamp body 22 each house a core of a current transformer in a circular ring-shaped case. The cable 23 houses and covers the winding wound around the current transformer and the conductor connected to the circuit in the main body 20.

[0027] The power measuring device 2 of the third embodiment is used by attaching a first clamp body 21 onto the coating of the power line L1 and attaching a second clamp body 22 to the power line L2. It is configured so that if a current is supplied to the power lines L1 and L2, power is stored in a power storage unit built into the main body 20. This allows the power measuring device 2 to perform power measurement using power from the power storage unit even if it is not electrically connected to a power source.

[0028] 6 is a block diagram showing the configuration of a power measuring device 2 according to the third embodiment. The power measuring device 2 includes a first current transformer 210 housed in a first clamp body 21 and a second current transformer 220 housed in a second clamp body 22.

[0029] In the power measuring device 2, a first full-wave voltage doubler rectifier circuit 201 and a second full-wave voltage doubler rectifier circuit 221 are mounted in parallel on a board accommodated in the main body 20. The first full-wave voltage doubler rectifier circuit 201 is connected to a first current transformer 210, and the second full-wave voltage doubler rectifier circuit 221 is connected to a second current transformer 220.

[0030] Of the two outputs of the first full-wave voltage doubler rectifier circuit 201, a first load resistor 202 is connected in parallel to the positive output. A first switch element 204 is connected between the first load resistor 202 and the negative output of the first full-wave voltage doubler rectifier circuit 201. A second load resistor 203 is connected in parallel to the negative output of the first full-wave voltage doubler rectifier circuit 201. A second switch element 205 is connected between the second load resistor 203 and the ground voltage.

[0031] The second full-wave voltage doubler rectifier circuit 221 shares a capacitor with the first full-wave voltage doubler rectifier circuit 201. The output of the positive side diode of the second full-wave voltage doubler rectifier circuit 221 is connected to the positive side output of the first full-wave voltage doubler rectifier circuit 201. The negative side diode of the second full-wave voltage doubler rectifier circuit 221 is connected in parallel with the negative side diode of the first full-wave voltage doubler rectifier circuit 201.

[0032] The substrate of the main body 20 is provided with a first control unit 206 that controls the on / off switching of each of the first switch element 204 and the second switch element 205.

[0033] The board of the main body 20 is provided with a first measurement unit 207 that measures effective power based on the voltage (Vo1P) of the first load resistor 202 and the voltage (Vo1M) of the second load resistor 203. The first measurement unit 207 calculates power from the potentials of one end (indicated as Vo1P in FIG. 6) of the first load resistor 202 and one end (indicated as Vo1M in FIG. 6) of the second load resistor 203 when the first control unit 206 turns on the first switch element 204 and the second switch element 205, that is, the voltage with respect to the ground. The method of calculating power is the same as that of the first measurement unit 107 in the first embodiment. In the configuration in which the first full-wave voltage doubler rectifier circuit 201 and the second full-wave voltage doubler rectifier circuit 221 in the third embodiment are connected in parallel, the effective power amount calculated by the first measurement unit 207 is the sum of the power amounts of the power lines L1 and L2.

[0034] As in the first embodiment, the first measuring unit 207 uses a phase measuring unit that measures the phase of the voltage in the first current transformer 210 and / or the second current transformer 220, and calculates an active power value using the measured phase. As in the first embodiment, the first measuring unit 207 calculates an active power value using an electric field probe.

[0035] The first full-wave voltage doubler rectifier circuit 201 is connected to the power storage unit 208. In the third embodiment, the power storage unit 208 employs the half-wave voltage doubler rectifier circuit 284 shown in the second embodiment. The half-wave voltage doubler rectifier circuit 284 of the power storage unit 208 includes a first capacitor 285 between a junction between the output of the first current transformer 210 and the input of the first full-wave voltage doubler rectifier circuit 201. The half-wave voltage doubler rectifier circuit 284 of the power storage unit 208 includes a capacitor 286 between a junction between the output of the second current transformer 220 and the input of the second full-wave voltage doubler rectifier circuit 221. The power storage unit 208 may be replaced with one using the constant voltage circuit shown in the first embodiment.

[0036] The output unit 209 is connected to the first measurement unit 207. The output unit 209 is a liquid crystal display, a seven-segment display, or the like. The output unit 209 is disposed on the surface of the main body 20. While the first measurement unit 207 is supplied with power from the power storage unit 208 and is activated, the first measurement unit 207 outputs to the output unit 209 a value of active power calculated using a voltage sampled at a predetermined sampling period. This allows a user of the power measuring device 2 to visually recognize the power.

[0037] In the power measurement device 2 of the third embodiment, similar to the effects of the power measurement device 1 of the first and second embodiments, it is possible to operate with the configuration of the power storage unit 208 without the need to prepare positive and negative power sources for measuring the voltage across the current transformer. In the configuration of the power measurement device 2 of the third embodiment, unlike bridge rectification or half-wave rectification circuits, the circuit using the first full-wave voltage doubler rectifier circuit 201 and the second full-wave voltage doubler rectifier circuit 221 can boost and use the rectified voltage, so that sufficient power can be obtained in the power storage unit 208 even if the amount of current flowing through the power lines L1 and L2 to be measured is small. The waveform of the total current obtained in the first current transformer 210 and the second current transformer 220 can be reproduced from the output from the first full-wave voltage doubler rectifier circuit 201 and the second full-wave voltage doubler rectifier circuit 221. In order to calculate the total power for the two power lines L1 and L2, the circuit scale can be kept small.

[0038] (Fourth embodiment) 7 is a block diagram showing the configuration of a power measurement device 3 according to the fourth embodiment. The power measurement device 3 according to the fourth embodiment uses two current transformers to measure and output the power supplied from two power lines L1 and L2. The external appearance of the power measurement device 3 according to the fourth embodiment is similar to that of the power measurement device 2 according to the third embodiment, and therefore is not shown in the drawings.

[0039] The power measuring device 3 includes a first current transformer 310 housed in a first clamp body, and a second current transformer 320 housed in a second clamp body.

[0040] In the power measuring device 3, a first full-wave voltage doubler rectifier circuit 311 connected to a first current transformer 310 is mounted on a board accommodated in the main body. A second full-wave voltage doubler rectifier circuit 321 connected to a second current transformer 320 is mounted on the same board. In the power measuring device 3 of the fourth embodiment, the first full-wave voltage doubler rectifier circuit 311 and the second full-wave voltage doubler rectifier circuit 321 are connected in series.

[0041] Of the two outputs of the first full-wave voltage doubler rectifier circuit 311, a first load resistor 312 is connected in parallel to the positive output. A first switch element 314 is connected between the first load resistor 312 and the negative output of the first full-wave voltage doubler rectifier circuit 311. A second load resistor 313 is connected in parallel to the negative output of the first full-wave voltage doubler rectifier circuit 311. A second switch element 315 is connected between the second load resistor 313 and the ground voltage.

[0042] Of the two outputs of the second full-wave voltage doubler rectifier circuit 321, the positive output is connected between the negative diode and the capacitor of the first full-wave voltage doubler rectifier circuit 311. Of the two outputs of the second full-wave voltage doubler rectifier circuit 321, the positive output is connected in parallel to a third load resistor 322. Between the third load resistor 322 and the negative output of the second full-wave voltage doubler rectifier circuit 321, a third switch element 324 is connected. To the negative output of the second full-wave voltage doubler rectifier circuit 321, a fourth load resistor 323 is connected in parallel. Between the fourth load resistor 323 and the ground voltage, a fourth switch element 325 is connected.

[0043] The substrate is provided with a first control unit 316 that controls on / off switching of each of the first switch element 314 and the second switch element 315. The substrate is provided with a second control unit 326 that controls on / off switching of each of the third switch element 324 and the fourth switch element 325.

[0044] The board is provided with a first measurement unit 317 that measures active power based on the voltage (Vo1P) of the first load resistor 312 and the voltage (Vo1M) of the second load resistor 313. The first measurement unit 317 calculates power from the potentials of one end (shown as Vo1P in FIG. 7) of the first load resistor 312 and one end (shown as Vo1M in FIG. 7) of the second load resistor 113, i.e., the voltages with respect to the ground, when the first control unit 316 turns on the first switch element 314 and the second switch element 315. The method of calculating power is the same as that of the first measurement unit 107 in the first embodiment.

[0045] The board is provided with a second measurement unit 327 that measures active power based on the voltage (Vo2P) of the third load resistor 322 and the voltage (Vo2M) of the fourth load resistor 323. The second measurement unit 327 calculates power from the potentials of one end (indicated as Vo2P in FIG. 7) of the third load resistor 322 and one end (indicated as Vo2M in FIG. 7) of the fourth load resistor 323, i.e., the voltages with respect to the ground, when the third switch element 324 and the fourth switch element 325 are turned on by the second control unit 326. The method of calculating power is the same as that of the first measurement unit 107 in the first embodiment.

[0046] In the fourth embodiment, in a configuration in which the first full-wave voltage doubler rectifier circuit 311 and the second full-wave voltage doubler rectifier circuit 321 are connected in series, the effective power amount and the second effective power amount in the first power line L1 are calculated by the first measurement unit 317 and the second measurement unit 327, respectively, on the same board.

[0047] As in the first embodiment, the first measurement unit 317 and the second measurement unit 327 each use a phase measurement unit (not shown) that measures the phase of the voltage in the first current transformer 310 and / or the second current transformer 320, and calculate an active power value using the measured phase. As in the first embodiment, the first measurement unit 317 and the second measurement unit 327 calculate an active power value using an electric field probe.

[0048] The power storage unit 308 of the power measurement device 3 is configured to supply power in common to the two sets of circuits for power measurement as described above. The power storage unit 308 includes a constant voltage circuit 382 connected to the positive output of the first full-wave voltage doubler rectifier circuit 311 via a backflow prevention diode 381, and a capacitor 383 connected to the output of the constant voltage circuit 382. The first control unit 316, the first measurement unit 317, the second control unit 326, the second measurement unit 327, and other circuits described below operate using the power stored in the capacitor 383.

[0049] The power storage unit 308 may be replaced with a boost circuit using the half-wave voltage doubler rectifier circuit shown in the second embodiment.

[0050] The power measuring device 3 of the fourth embodiment includes an output unit 309. The output unit 309 is connected to a first measuring unit 317 and a second measuring unit 327. The output unit 309 is a liquid crystal display, a 7-segment display, or the like. The output unit 309 is disposed on the surface of the main body. While the first measuring unit 317 and the second measuring unit 327 are supplied with power from the power storage unit 308 and are activated, the first measuring unit 317 and the second measuring unit 327 each output a numerical value of active power calculated using a voltage sampled at a predetermined sampling period to the output unit 309. This allows a user of the power measuring device 3 to visually recognize the power.

[0051] Fifth embodiment 8 is a schematic diagram of a power measurement system 600 using a power measurement device 4. The power measurement system 600 includes one or more power measurement devices 4 each having a clamp body 41 attached to each power line of a distribution board in a home or facility, one or more measurement sensors 5, and a server device 6 capable of transmitting and receiving data to and from each power measurement device 4 and the measurement sensor 5. The power measurement system 600 further includes an information terminal device 7 capable of communication connection with the server device 6. The information terminal device 7 is the owner or manager of the home or facility. The power measurement device 4, the measurement sensor 5, the server device 6, and the information terminal device 7 can be communication connected via a network N.

[0052] The network N includes a public communication network N1, which is the so-called Internet, a carrier network N2, and each local network N3. The local network N3 is a wired and / or wireless network installed in a home or facility.

[0053] In the power measurement system 600, power data measured by a power measurement device 4 attached to a power line supplying power to an air conditioning facility installed in a home or facility is transmitted to a server device 6, and temperature data is transmitted from a measurement sensor 5, which is a thermometer attached to the same home or facility, to the server device 6. Identification data for identifying the data content is added to these data, and the server device 6 can identify which home or facility the data belongs to.

[0054] In the power measurement system 600, the server device 6 functions as an EMS (Energy Management System) installed in each home or facility, and creates graphic data that visualizes power and environmental data (temperature) based on the power and temperature obtained from the power measurement device 4. The server device 6 transmits the graphic data to an information terminal device 7, and makes it viewable by the owner or manager of the home or facility. This enables the owner or manager of the home or facility to understand appropriate power usage, such as whether the room is being overcooled by the air conditioning equipment.

[0055] FIG. 9 is a block diagram showing the configuration of the power measuring device 4. The power measuring device 4 includes a current transformer 410 and a first full-wave voltage doubler rectifier circuit 401 connected to the current transformer 410. A first load resistor 402 is connected in parallel to the positive output of the two outputs of the first full-wave voltage doubler rectifier circuit 401. A first switch element 404 is connected between the first load resistor 402 and the negative output of the first full-wave voltage doubler rectifier circuit 401. A second load resistor 403 is connected in parallel to the negative output of the first full-wave voltage doubler rectifier circuit 401. A second switch element 405 is connected between the second load resistor 403 and a ground voltage.

[0056] The power measurement device 4 includes a first control unit 406 that controls the first switch element 404 and the second switch element 405 to switch on / off. The power measurement device 4 is provided with a first measurement unit 407 that measures active power based on the voltage (Vo1P) of the first load resistor 402 and the voltage (Vo1M) of the second load resistor 403. The first measurement unit 407 measures the voltage with respect to the ground from the potential of one end of the first load resistor 402 and one end of the second load resistor 403 when the first control unit 406 turns on the first switch element 404 and the second switch element 405, and calculates the power as described later. The operation of the first measurement unit 407 is similar to that of the power measurement device 1 of the first embodiment, so a detailed description will be omitted.

[0057] The first full-wave voltage doubler rectifier circuit 401 is connected to a power storage unit 408. The power storage unit 408 includes a constant voltage circuit 482 connected to the positive output of the first full-wave voltage doubler rectifier circuit 401 via a backflow prevention diode 481, and a capacitor 483 connected to the output of the constant voltage circuit 482. The power stored in the capacitor 483 operates the first control unit 406, the first measurement unit 407, and each circuit of the wireless communication unit 440 described below.

[0058] The power measuring device 4 includes a wireless communication unit 440 that wirelessly transmits the effective power value calculated by the first measuring unit 407 to another device. The first control unit 406, the first measuring unit 407, and the wireless communication unit 440 may be implemented as functions of one processing unit (microcontroller). The wireless communication unit 440 may be a wireless LAN (Local Area Network) communication device or a short-range wireless communication device such as Bluetooth (registered trademark).

[0059] The first measuring unit 407 stores in memory the value of the active power calculated using the voltage sampled at a predetermined sampling period in association with time information. The first measuring unit 407 periodically or in response to a request from the server device 6, transmits the value of the active power stored in the memory from the wireless communication unit 440 to the server device 6 with the identification data stored in the memory added thereto.

[0060] The measurement sensor 5 includes a temperature sensor and a processing unit including a memory, a CPU, and a wireless communication unit. The processing unit of the measurement sensor 5 periodically transmits temperature data obtained from the temperature sensor together with the identification data stored in the memory from the wireless communication unit to the server device 6.

[0061] 10 is a block diagram showing the configuration of the server device 6. In the following description, the server device 6 will be described as one server computer, but may be configured to be distributed among multiple computers according to processing content, function, etc. The server device 6 includes a processing unit 60, a storage unit 61, and a communication unit 62.

[0062] The processing unit 60 is a processor using a CPU and / or a GPU (Graphics Processing Unit). The processing unit 60 uses built-in memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory) to control each component and execute processing. The processing unit 60 may be configured as a single piece of hardware (SoC: System On a Chip) that integrates a processor, memory, communication devices, etc. The processing unit 60 executes the processing described below based on an information processing program P6 stored in the storage unit 61.

[0063] The storage unit 61 uses a non-volatile storage medium such as a hard disk, and stores programs and data referenced by the processing unit 60. The storage unit 61 stores an information processing program P6. The information processing program P6 stored in the storage unit 61 may be a program that the processing unit 60 reads out and replicates the information processing program P6 stored in the storage medium 9. The information processing program P6 may be a program that the server device 6 downloads from a program server (not shown), stores in the storage unit 61, and installs.

[0064] The communication unit 62 is a communication device that realizes communication via the network N. The communication unit 62 is, for example, a network card compatible with the network N. The communication unit 62 may realize wireless communication.

[0065] The server device 6 thus configured receives data every time it is transmitted from the power measuring device 4 and the measurement sensor 5. The data transmitted from the power measuring device 4 and the measurement sensor 5 includes the calculated active power value and temperature data associated with time information, together with identification data assigned to the power measuring device 4 and the measurement sensor 5, respectively. The server device 6 sequentially stores the received data in the storage unit 61 in association with the identification data assigned to the power measuring device 4 and the measurement sensor 5, respectively. The storage unit 61 of the server device 6 stores the identification data of the power measuring device 4 and the measurement sensor 5 installed there in association with facility identification data that identifies a home or facility. The facility identification data corresponds to account data of the owner or manager of the home or facility, and the address and contact information of the home or facility.

[0066] 11 is a block diagram showing the configuration of the information terminal device 7. The information terminal device 7 may be a so-called smartphone or tablet type communication terminal, or may be a desktop or laptop type personal computer. The information terminal device 7 includes a processing unit 70, a storage unit 71, a communication unit 72, a display unit 73, and an operation unit 74.

[0067] The processing unit 70 is a processor using a CPU or a GPU. The processing unit 70 displays a screen based on graphic data provided by the server device 6 on the display unit 73 based on an application program P7 stored in the storage unit 71. The application program P7 may be a Web browser program.

[0068] The storage unit 71 uses a non-volatile memory such as a hard disk or a flash memory. The storage unit 71 stores various programs including the application program P7, and account data of the owner or manager of each home or facility who is the user of the information terminal device 7. The application program P7 may be an application program P8 stored in the storage medium 8 that is read by the processing unit 70 and copied into the storage unit 71. The application program P8 may be downloaded by the information terminal device 7 from a program server (not shown), stored in the storage unit 71, and installed.

[0069] The communication unit 72 is a communication device that realizes communication with the server device 6 via the network N. A network card for wired communication, a wireless communication device for carrier communication, or a wireless LAN device is used. The processing unit 70 can be communicatively connected to the server device 6 via the network N by the communication unit 72.

[0070] The display unit 73 uses a display such as a liquid crystal display or an organic EL (Electro Luminescence) display. The display unit 73 displays a screen based on graphic data provided by the server device 6 through processing based on the application program P7 of the processing unit 70. The display unit 73 may be a display with a built-in touch panel or a display without a built-in touch panel.

[0071] The operation unit 74 is a user interface such as a keyboard and a pointing device capable of inputting and outputting data to and from the processing unit 70, or a voice input unit. The operation unit 74 may be a touch panel of the display unit 73, or a physical button provided on the housing. The operation unit 74 notifies the processing unit 70 of operation information.

[0072] 12 is a flowchart showing an example of a processing procedure in the power measurement system 600. The owner or manager of each home or facility uses the information terminal device 7 to request the server device 6 to acquire information about the power usage status of the target home or facility based on the application program P7 (step S101). The request includes account data of the owner or manager of each home or facility.

[0073] When the server device 6 receives a request to acquire the power usage status (step S201), it identifies facility identification data of the target home or facility based on the account data included in the request (step S202). The processing unit 60 identifies the identification data of the power metering device 4 and the measurement sensor 5 installed in the target home or facility, that is, the power metering device 4 and the measurement sensor 5 associated with the facility identification data (step S203). The processing unit 60 creates a screen in which the distribution of active power values ​​in a recent predetermined period associated with the identified identification data and the distribution of temperature data in the predetermined period are converted into graphic data (step S204). The processing unit 60 transmits screen data for displaying the created screen on the information terminal device 7 to the information terminal device 7 that is the request source (step S205).

[0074] The information terminal device 7 receives the screen data in response to the request (step S102), displays a screen on the display unit 73 based on the received screen data (step S103), and ends the process.

[0075] FIG. 13 is a diagram showing an example of graphic data provided by the server device 6. FIG. 13 shows an example of a screen 730 displayed on the display unit 73 based on the application program P7 of the information terminal device 7. The screen 730 includes a graph 731 showing the distribution of active power values ​​in a predetermined period and a graph 732 showing the distribution of temperature data in a predetermined period. By displaying the active power values ​​from the power measuring device 4 and the temperature data from the measurement sensor 5 in parallel on the display unit 73 of the information terminal device 7, it is possible to compare and visualize the environmental data and the amount of power used. Other examples of the measurement sensor 5 include an illuminance sensor, a humidity sensor, and a human presence sensor. It is also possible to compare the illuminance sensor with the amount of power used by a lighting device, the humidity sensor with the amount of power used by a humidifier, and the presence / absence of a person from a human presence sensor with the amount of power used by a digital home appliance such as a television.

[0076] Graphic data such as that shown in FIG. 13 allows the owner or manager of a home or facility to understand appropriate power usage on the information terminal device 7, such as whether the room is being overcooled by the air conditioning equipment.

[0077] The power measurement system 600 of the fifth embodiment has been described as being configured to utilize the power measurement device 1 illustrated in the first embodiment, but it may utilize any of the power measurement devices 1, 2, and 3 illustrated in the first to fourth embodiments, or may be mixed.

[0078] The embodiments disclosed above are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0079] 1,2,3,4 Power Measuring Device 10,20 Main unit 110,410 Current transformer 210,310 First current transformer 220,320 Second current transformer 101, 201, 311, 401 First double-wave voltage doubler rectifier circuit 221,321 Second wave double voltage rectifier circuit 102,202,312,402 1st load resistance 103,203,313,403 2nd load resistance 322 3rd load resistance 323 4th load resistance 104, 204, 314, 404 First switch element 105, 205, 315, 405 Second switch element 324 Third Switch Element 325 4th switch element 106, 206, 316, 406 First Control Section 107,207,317,407 First Measurement Section 326 Second Control Section 327 Second Measurement Division 108,208,308,408 Power storage unit 181,381,481 Reverse current prevention diode 182,382,482 Constant voltage circuit 183,283,383,483 Capacitors 184,284 Half-wave voltage doubler rectifier circuit 109,209,309 Output section 440 Wireless Communication Department 5. Measurement Sensors 600 Power Measurement System 6 Server equipment 60 Processing section 7 Information terminal equipment 73 Display section 730 screens

Claims

1. A power measuring device that measures power flowing through a first power line using a first current transformer, a first full-wave voltage doubler rectifier circuit connected to an output of the first current transformer; A first load resistor connected in parallel to one output side of the first full-wave voltage doubler rectifier circuit; A second load resistor connected in parallel to the other output side of the first full-wave voltage doubler rectifier circuit; a first control unit that controls on / off switching of a first switch element connected to the first load resistor and a second switch element connected to the second load resistor; a first measurement unit that measures potentials at one end of the first load resistor and one end of the second load resistor when the first switch element and the second switch element are turned on, and obtains a current value; a power storage unit connected to the first full-wave voltage doubler rectifier circuit; Equipped with The first control unit and the first measurement unit are operated by power from the power storage unit. Power measuring equipment.

2. The power storage unit is a constant voltage circuit connected to the output of the first full-wave voltage doubler rectifier circuit via a backflow prevention diode; a capacitor connected to the output of the constant voltage circuit; Including, The power measurement device according to claim 1 .

3. The power storage unit is a half-wave voltage doubler rectifier circuit connected to an output of the first current transformer and an output of the first full-wave voltage doubler rectifier circuit; A capacitor connected to the output of the half-wave voltage doubler rectifier Includes The power measurement device according to claim 1 .

4. The first measurement unit is calculating a reproduced waveform of a voltage in the first power line by a predetermined calculation using a voltage value of the first load resistor and a voltage value of the second load resistor; Calculate the effective power based on the calculated reproduced waveform The power measuring device according to claim 1 .

5. a phase measurement unit that measures a phase of a voltage in the first current transformer, The first measurement unit calculates an active power value using the measured phase. The power measurement device according to claim 4 .

6. Further comprising a wireless communication unit, The first measuring unit wirelessly transmits the calculated active power value to another device. The power measurement device according to claim 4 .

7. a second current transformer attached to the second power line; a second full-wave voltage doubler rectifier circuit connected to the output of the second current transformer; Further comprising: The first full-wave voltage doubler rectifier circuit and the second full-wave voltage doubler rectifier circuit are connected in parallel. The power measurement device according to claim 1 .

8. The first measurement unit is calculating reproduced waveforms of voltages in the first power line and the second power line by a predetermined calculation using a voltage value of the first load resistor and a voltage value of the second load resistor; Calculate the total effective power based on the calculated reproduced waveform The power measurement device according to claim 7.

9. a second current transformer attached to the second power line; a second full-wave voltage doubler rectifier circuit connected to the output of the second current transformer; A third load resistor connected in parallel to one output side of the second full-wave voltage doubler rectifier circuit; A fourth load resistor connected in parallel to the other output side of the second full-wave voltage doubler rectifier circuit; a second control unit that controls on / off switching of a third switch element connected to the third load resistor and a fourth switch element connected to the fourth load resistor; a second measurement unit that measures potentials at one end of the third load resistor and one end of the fourth load resistor when the third switch element and the fourth switch element are turned on, and determines a current value; Equipped with The first full-wave voltage doubler rectifier circuit, the second full-wave voltage doubler rectifier circuit, and the power storage unit are connected in series, The second control unit and the second measurement unit are operated by power from the power storage unit. The power measurement device according to claim 1 .

10. The first measurement unit is calculating a reproduced waveform of a voltage in the first power line by a predetermined calculation using a voltage value of the first load resistor and a voltage value of the second load resistor; Calculating an active power in the first power line based on the calculated reproduced waveform; The second measurement unit is calculating a reproduced waveform of a voltage in the second power line by a predetermined calculation using a voltage value of the third load resistor and a voltage value of the fourth load resistor; Calculating the effective power in the second power line based on the calculated reproduced waveform The power measurement device according to claim 9.

11. a phase measurement unit that measures a phase of a voltage in the first current transformer or the second current transformer, The first measurement unit calculates an active power value using the measured phase. The power measuring device according to claim 8 or 10.

12. Further comprising a wireless communication unit, The wireless communication unit wirelessly transmits the calculated effective power value on the first power line or the second power line to another device. The power measuring device according to claim 8 or 10.

13. A plurality of power measurement devices according to claim 6; a server device that transmits and receives data to and from the power measuring device via wireless communication; Including, The server device includes: Acquiring active power values ​​for each of the electric loads obtained from the plurality of power measuring devices; Based on the obtained active power value for each electric load, data regarding the use of the electric load in a location where a plurality of the electric power measuring devices are installed is output.

2. A power measurement system as described herein.

14. a measuring device that measures an environmental index of a location where the power measuring device is installed and transmits the measurement result to the server device by wireless; The server device includes: Outputting data showing the correlation between the acquired effective power value for each electric load and the measurement result measured by the measuring device The power measurement system of claim 13.

15. A plurality of power measurement devices according to claim 12; a server device that transmits and receives data to and from the power measuring device via wireless communication; Including, The server device includes: Acquiring active power values ​​for each of the electric loads obtained from the plurality of power measuring devices; Based on the obtained active power value for each electric load, data regarding the use of the electric load in a location where a plurality of the electric power measuring devices are installed is output.

2. A power measurement system as described herein.

16. a measuring device that measures an environmental index of a location where the power measuring device is installed and transmits the measurement result to the server device by wireless; The server device includes: Outputting data showing the correlation between the acquired effective power value for each electric load and the measurement result measured by the measuring device The power measurement system of claim 15.

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