JP5847611B2 - Current measurement system, parent device, child device, and control method of current measurement system - Google Patents

Description

  The present invention relates to a current measurement system that measures a main current and a branch current, a parent device and a child device included in the current measurement system, and a control method for the current measurement system, and in particular, reduces wasteful power consumption of the current measurement system itself. Related to technology.

  In recent years, in order to optimize power consumption in homes and business facilities, current measurement systems that measure current consumption and notify the user have been proposed. Patent Document 1 describes an example of a current measurement system. The current measurement system is provided for, for example, an existing distribution line in a home or business facility. Existing distribution lines are connected to the commercial power supply system and supplied with power from the commercial power supply system, and branch from the main line via the distribution board to supply power to the home and business facilities. Has a branch line. The current measurement system has a current sensor for detecting a current inside the electric wire from an electromagnetic field outside the electric wire, for example, for each main trunk line and branch line. Further, the current measurement system includes a slave unit for each current sensor that acquires and stores measurement data from the current sensor, and a master unit that collects measurement data from each slave unit. Data communication between the child device and the parent device is performed, for example, by radio every certain time or every certain amount of data. Based on the collected measurement data, the master unit obtains current for each main line or branch line, and outputs data related to the power consumption to be presented to the user to a display device or the like.

JP 2004-170276 A

  In the current measurement system as described above, it is also required to optimize the power consumption of the current measurement system itself. For example, considerable power is consumed for wireless transmission of current measurement data from each child device to the parent device. On the other hand, power consumption varies depending on time zones. For example, the power consumption increases in the morning and evening hours when the user is active, but the power consumption is low during the day when the user goes out or at night while sleeping. Therefore, it is not always necessary for the parent device to collect measurement data from the child device, and there is room for reducing unnecessary power consumption.

  Accordingly, an object of the present invention is to provide a current measurement system, a parent device, a child device, and a control method for the current measurement system that can reduce waste of power consumption of the device itself.

  In order to achieve the above object, a current measurement system according to one aspect of the present invention includes a slave unit that respectively obtains measurement data of a main line current to which power is supplied and a branch line current branched from the main line. The master unit transmits a control signal for causing the slave unit to execute or stop transmission of the measurement data of the current of the trunk line based on the measurement data of the main line transmitted from the slave unit. And have.

  In one aspect of the above aspect, the master unit receives the control signal for executing transmission of the measurement data of the current of the main line when the current of the main line exceeds a reference value, or the current of the main line The control signal for stopping the transmission of the measurement data of the current of the main line when the reference value is below is transmitted.

  In another aspect of the above aspect, the base unit is configured to transmit the measurement data of the main line current when the amount of change in the main line current exceeds a reference value, or the main signal. The control signal for stopping the transmission of the measurement data of the current of the main line is transmitted when the change amount of the main line current is less than the reference value.

  In another aspect of the above aspect, the slave has a storage unit that stores the acquired measurement data of the current of the branch line, and the remaining amount of the storage unit is less than or equal to a predetermined remaining amount. As described above, the measurement data of the current of the branch line is transmitted to the parent device.

  In the current measurement system according to the above aspect, the master unit transmits a control signal to the slave unit to stop or execute transmission of the measurement data to the slave unit based on the measurement data of the main line current. It is possible to reduce the wasteful current consumption for transmitting the measurement data from the machine to the parent machine, thereby reducing the wasteful power consumption of the current measurement system.

It is a figure which shows the structural example of the electric current measurement system in 1st Embodiment. It is a figure which shows the example of the main current and branch current which the main | base station 106 collects in the current measurement system 100. FIG. It is a figure explaining operation | movement of the electric current measurement system 100 in 1st Embodiment. It is a flowchart figure which shows the operation | movement procedure of the electric current measurement system in 1st Embodiment. It is a flowchart figure which shows the operation | movement procedure of the electric current measurement system in 1st Embodiment. It is a figure explaining the variation | change_quantity of main current, and operation | movement of the electric current measurement system 100 in 2nd Embodiment. It is a figure explaining the variation | change_quantity of main current, and operation | movement of the electric current measurement system 100 in 2nd Embodiment. It is a flowchart figure which shows the operation | movement procedure of the electric current measurement system in 2nd Embodiment. It is a figure which shows the structural example of the electric current measurement system in a modification. It is a flowchart figure which shows the operation | movement procedure of the electric current measurement system of a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments, but extends to the matters described in the claims and equivalents thereof.

[First Embodiment]
FIG. 1 shows a configuration example of a current measurement system in the first embodiment. This current measurement system 100 is a configuration example in the case where a plurality of branch lines are branched from a main trunk line and two branch lines are controlled. However, the case where one or three or more branch lines are controlled is also included in the first embodiment.

  The current measurement system 100 includes a main line current sensor 101, two branch line current sensors 110, a main line child device 102, two branch line child devices 111, and a parent device 106. The main line current sensor 101 and the main line current sensor 110 are provided in the vicinity of the main line and the main line in the distribution board (not shown) or in the vicinity thereof. The main line current sensor 101 detects the current of the main line, and the main line current sensor 110 detects the current of the main line to which each is assigned. As a method for detecting current, for example, a method for detecting current from an electromagnetic field around the electric wire, a method for directly measuring current, and the like are possible. And each measurement data is transmitted to the subunit | mobile_unit 102,111 by wired or wireless communication. Moreover, the subunit | mobile_unit 102,111 acquires the power supply required for operation | movement from the built-in battery and the outlet of a main line or a trunk line.

  The subunit | mobile_unit 102 has the control part 103, the memory 104, the communication part 105, and interface part 102b mutually connected by the bus | bath 102a. Measurement data of the main line current (hereinafter referred to as main current) transmitted from the main line current sensor 101 is transmitted to the bus 102 a via the interface unit 102 b and stored in the memory 104 by the control unit 103. The measurement data stored in the memory 104 is wirelessly transmitted from the communication unit 105 to the parent device 106 by the control unit 103. The control unit 103 controls reading / writing of data from / to the memory 104 and the operation of the communication unit 105. For example, the control unit 103 transmits the measurement data stored in the memory 104 to the parent device 106 at a predetermined cycle (for example, several seconds to several tens of seconds) or when the data amount in the memory 104 reaches a predetermined amount.

  In addition, each slave unit 111 includes an interface unit 116, a control unit 112, a memory 113, and a communication unit 114 that are connected via a bus 118. The description of the operation of the control unit 112, the memory 113, the communication unit 114, and the interface unit 116 in the slave unit 111 is for measurement data of a branch line current (hereinafter referred to as a branch current) from the branch line current sensor 110. Except for the above, the description is the same as the description of the control unit 103, the memory 104, the communication unit 105, and the interface unit 102b in the slave unit 102 described above.

  The base unit 106 includes a control unit 107, a memory 109, a communication unit 108, and an interface unit 106a connected by a bus 109a. The control unit 107 controls reading / writing of data from / to the memory 109 and the operation of the communication unit 108. Measurement data of the main current and the main current transmitted from the slave units 102 and 111 are transmitted to the bus 109 a after being received by the communication unit 108 and stored in the memory 109 by the control unit 107. The measurement data stored in the memory 109 is output by the control unit 107 via the interface unit 106a to, for example, an information processing apparatus such as a personal computer or a home network to which the information processing apparatus is connected. The Then, the information processing apparatus processes the measurement data into power consumption information for each main line or branch line and outputs it to a display device or the like. Thus, power consumption information is presented to the user.

  FIG. 2 is a diagram illustrating an example of a main current and a main current collected by the parent device 106 in the current measurement system 100. Here, an example in which the control in the first embodiment is not performed is shown. For example, the horizontal axis represents time and the vertical axis represents current, and a line graph corresponding to the transition of the main current and the transition of the branch current of two branch lines is shown. In the figure, the uppermost line graph indicated by a solid line shows the transition of the main current. The two line graphs below it show the transition of the two branch currents. The main current includes the cumulative total of the main current of the main line that branches from the main current.

  As shown in FIG. 2, the overall current consumption, that is, the main current, varies depending on the time zone. For example, in the time zone T1 from midnight (2011/6/9, 0:00) to early morning (2011/6/9, 4:48), the main current is relatively small because the user is sleeping (approximately 4A (ampere) or less). In the morning time zone (˜7: 12) T2 thereafter, the user starts the activity, so the main current rapidly increases (approximately 4A to 18A). Then, in the subsequent time zone from daytime to night (˜19: 12) T3, since the user is going out, the main current becomes the smallest (approximately 3 A or less). Then, in the subsequent time zone until midnight (˜0: 00) T4, the main current is rapidly increased (generally 5A to 18A) because it is active until the user goes home and goes to bed.

  In such a current consumption situation, for example, in the time zones T1 and T3, the main current is kept at a low value over several hours. This corresponds to the fact that the branch current of each branch line also changes at a low value as shown in the figure. In such a time zone, there is little need to frequently collect measurement data from handset 111 and present it to the user. Therefore, there is room for reducing the power consumed by wireless communication. Therefore, in the first embodiment, such unnecessary power consumption is avoided by the control described below.

  In the current measurement system 100 according to the first embodiment, the master unit 106 collects measurement data transmitted from the slave unit 111 and causes the slave unit 111 to stop or execute transmission of measurement data according to the current of the main line. Control signal is transmitted to the slave unit 111. For example, the control unit 107 reads the measurement data stored in the memory 109 when a predetermined period (for example, several seconds to several tens of seconds) or the data amount of the memory 109 reaches a predetermined amount, and the main current Based on the above, a control signal is generated. The control signal is, for example, a stop signal for instructing to stop transmission of measurement data of the trunk current, or a release signal for instructing to resume transmission by canceling the transmission stop. Each control signal is transmitted to the slave unit 111 by the communication unit 108. For example, when the slave unit 111 stops transmission of the measurement data of the corresponding branch current to the master unit as a basic operation (hereinafter referred to as sleep mode for convenience), the master unit 106 When the main current exceeds a reference value (that is, a predetermined threshold), a release signal is transmitted to the slave unit 111. Or, as a basic operation, the slave unit 111 is transmitting measurement data of a corresponding branch current to the master unit 106 in a predetermined processing cycle (for example, every several seconds to several tens of seconds) (hereinafter, For convenience, the master unit 106 transmits a stop signal to the slave unit 111 when the main current falls below a predetermined threshold.

  On the other hand, the slave unit 111 executes or stops transmission of the measurement data of the trunk current in response to the control signal from the master unit 106. For example, when a release signal is transmitted, in response to this, the control unit 112 transmits measurement data that has been stopped. Alternatively, when a stop signal is transmitted, in response to this, the control unit 112 stops transmitting measurement data from the communication unit 105. Further, instead of executing or stopping the transmission operation from the communication unit 105, the slave unit 111 executes or stops the acquisition of measurement data in response to the stop signal or the release signal. For example, while causing the communication unit 105 to periodically perform a transmission operation, the control unit 112 responds to the release signal and writes measurement data to the memory 104 that has been stopped until then. Thereby, the measurement data stored in the memory 104 is transmitted. Alternatively, the control unit 112 stops writing measurement data to the memory 104 in response to the stop signal. As a result, the measurement data is not accumulated in the memory 104 and is not transmitted from the communication unit 105. By doing so, power consumption can be further reduced. The storage of the measurement data in the memory 104 and the transmission of the measurement data from the communication unit 105 may be executed or stopped together.

  FIG. 3 is a diagram for explaining the operation of the current measurement system 100 according to the first embodiment. In FIG. 3, the transition when the control of the first embodiment of the main current and the two branch currents shown in FIG. 2 is performed is shown with the horizontal axis representing time and the vertical axis representing current.

  For example, FIG. 3 shows an example of control when the slave unit 111 operates in the sleep mode. For example, in the time zone T1 in which the main current is less than the threshold value I (5A), the slave unit 111 stops transmitting the measurement data of each main current. Therefore, the line graph corresponding to the branch current shows 0A. Next, in the time zone T2, the main current increases or decreases across the threshold value I. When the main line current exceeds the threshold value I, base unit 106 transmits a release signal to handset 111. The subunit | mobile_unit 111 transmits measurement data in response to a cancellation | release signal. Then, correspondingly, the branch current increases to a value larger than 0A. In the time zone T3, the main line current changes below the threshold value I. Therefore, the subunit | mobile_unit 111 returns to sleep mode, and stops transmission of measurement data. In the time zone T4, the main line current increases or decreases across the threshold value I. Therefore, the same control as in time zone T2 is executed. As described above, the slave unit 111 stops transmitting measurement data when the current consumption amount is small, and causes the slave unit 111 to transmit measurement data when the current consumption amount increases. In addition to collecting, it is possible to save unnecessary power consumption of the slave unit 111.

  4 and 5 are flowcharts showing the operation procedure of the current measurement system in the first embodiment. The procedure shown in FIG. 4 is an operation procedure of the parent device 106 and the child device 102 of the current measurement system 100. Further, the procedure shown in FIG. 5 is an operation procedure of the slave unit 111. The procedure shown in FIGS. 4 and 5 corresponds to the control procedure when the slave unit 111 is in the sleep mode.

  First, in FIG. 4, when the current measurement system is turned on (S402), steps S404 to S409 are executed every time a predetermined period t (for example, several seconds to several tens of seconds) elapses (YES in S403). . That is, the slave unit 102 acquires the measurement data of the main current (S404), and transmits the main current measurement data to the base unit 106 (S405). Next, when the main current is equal to or less than the threshold value I (YES in S407), the base unit 106 proceeds to step S409. On the other hand, when the main current is larger than the threshold value I (NO in S407), the parent device 106 transmits a release signal to the child device 111 to shift the child device 111 to the wake-up mode (S408). In response to the release signal, the slave unit 111 executes the procedure shown in FIG. In step S409, it is determined whether the power is turned off. Until the power is turned off (NO in S409), the above steps S403 to S408 are executed. When the power is turned off (YES in S409), the master unit 106 and the slave unit 102 end the processing.

  In FIG. 5, when the slave unit 111 in the sleep mode receives the release signal from the master unit 106 (S502), the slave unit 111 temporarily shifts to the wake-up mode. That is, the subunit | mobile_unit 111 acquires the measurement data of a corresponding branch current from the current sensor 110, respectively (S503), and stores measurement data in each memory 113 (S504). Next, the slave unit 111 determines whether or not the remaining amount of the memory 113 is equal to or less than a predetermined threshold value β (S505). Here, the threshold value β is an arbitrary threshold value determined in advance, and for example, a capacity is used such that the remaining amount of memory becomes insufficient due to the storage of additional measurement data. When the remaining amount of the memory 113 is less than the threshold β (NO in S505), that is, when there is a margin in the remaining amount of the memory 113, the slave unit 111 shifts to the sleep mode (S507) and ends the process. When the remaining amount of the memory 113 is equal to or less than the threshold β (YES in S505), the slave unit 111 transmits the measurement data stored in the memory 113 to the master unit 106, and clears the data in the memory 113 (S506). . And the subunit | mobile_unit 111 transfers to sleep mode (S507), and complete | finishes a process.

  In this way, the slave unit 111 temporarily shifts to the wake-up mode and transmits measurement data when a release signal is transmitted from the master unit 106 in the sleep mode. By doing so, the power required for wireless transmission can be reduced as compared with the case of operating in the always wake-up mode. Further, since the measurement data is transmitted every time the remaining amount of the memory 113 becomes equal to or less than the threshold value β, transmission is performed for each measurement data buffered according to the capacity of the memory 113. Therefore, the communication frequency can be reduced correspondingly, and the power required for wireless transmission can be saved.

  4 and 5 show the control procedure when the slave unit 111 is in the sleep mode. However, on the contrary, if the main current becomes small when the slave unit 111 is in the wake-up mode, for example, if it falls below the threshold value, the master unit 106 can also instruct the slave unit 111 to shift to the sleep mode. . For example, instead of steps S407 and S408 in FIG. 4, when the main current falls below the threshold value I, the base unit 106 can send a stop signal to the handset 111 to shift to the sleep mode. . Corresponding to this, for example, in FIG. 5, the reception of the stop signal from the parent device 106 is confirmed instead of step S502, and if the stop signal is not received, steps S503 to S506 are executed, and the wakeup is performed in step S507. It is possible to set the procedure to shift to the up mode so that steps S503 to S506 are not executed when a stop signal is received.

[Second Embodiment]
The current measurement system in the second embodiment has the configuration shown in FIG. In the second embodiment, for example, when the slave unit 111 is in the sleep mode, the master unit 106 transmits a release signal to the slave unit 111 and shifts to the wake-up mode when the amount of change in the main current exceeds a predetermined threshold. Let On the other hand, when the slave unit 111 is operating in the wake-up mode, the master unit 106 transmits a stop signal to the slave unit 111 to shift to the sleep mode when the amount of change in the main current falls below a predetermined threshold.

  According to the second embodiment, since the main current is large but stable because the individual main currents are stable within a certain range, therefore, the frequency of transmission of the measurement data of the main current from the slave unit is stable. Even when the power consumption is reduced, the power consumption can be further reduced by reducing the frequency of transmission of the measurement data from the handset when there is no problem in grasping the power consumption trend. For example, power consumption fluctuates due to various factors such as the season, family structure, holidays / weekdays, replacement of electrical equipment, etc., but by controlling based on the amount of change in current instead of a uniform threshold, such fluctuation can be reduced. It can respond flexibly and can reduce power consumption efficiently.

  6 and 7 are diagrams for explaining the main current change and the operation of the current measurement system 100 according to the second embodiment.

  In FIG. 6, in the enlarged view of the time zones T1, T2, and T3 centering on the time zone T2 shown in FIGS. 2 and 3, the main current (marked with “◯”) and the two branch currents (“◇”). And the transition of the amount of change in the main current (marked with “□”) are respectively shown by line graphs. The amount of change is, for example, the absolute value of the difference between the main current in the immediately preceding processing cycle and the latest main current.

  In the second embodiment, when the slave unit 111 is in the sleep mode, that is, when the acquisition and transmission of the measurement data of the corresponding branch current are stopped, the master unit 106 has a main current of a predetermined threshold value. When α is exceeded, a release signal is transmitted to the slave unit 111 to shift to the wake-up mode. The threshold value α is, for example, an arbitrary value of several tens of millimeters to several amperes, and is set in advance through experiments, simulations, or the like. Alternatively, when the slave unit 111 is in the wake-up mode, the master unit 106 transmits a stop signal to the slave unit 111 to shift to the sleep mode when the amount of change in the main current falls below a predetermined threshold value α.

  In FIG. 7, in the enlarged views of the time zones T1, T2, and T3 shown in FIGS. 2 and 3, a line graph showing the main current and the two branch currents is shown in order from the top. In the figure, the values of the two branch currents in the sleep mode are 0 A (amperes). For example, as shown in FIG. 6, in time zones T1 and T3, since the amount of change in the main current is less than the threshold value α, the slave unit 111 remains in the sleep mode. Therefore, the two branch currents are 0A. On the other hand, in the time zone T2, the amount of change increases or decreases across the threshold value α. Therefore, when the change amount is less than or equal to the threshold value α, the slave unit 111 is in the sleep mode and the branch current is 0 A. However, when the change amount exceeds the threshold value α, the slave unit 111 is in the wake-up mode and the branch current is less than 0 A. growing.

  Here, for comparison with the first embodiment, the branch current in the time zone T ′ within the time zone T2 is examined. In the first embodiment, the threshold I is 5A. Then, since the main current exceeds the threshold throughout the time period T ′, the measurement of the main current is not stopped. On the other hand, in the second embodiment, by performing control based on the change amount of the main current, transmission of the measurement data of the main current can be stopped when the change amount is large even in the time zone T ′. More opportunities for the two branch currents to become 0 A can be secured. That is, according to the second embodiment, more opportunities to reduce the power required for wireless communication of measurement data can be secured, and wasteful current consumption can be more efficiently reduced.

  FIG. 8 is a flowchart showing an operation procedure of the current measurement system according to the second embodiment. The procedure shown in FIG. 8 is an operation procedure of the parent device 106 and the child device 102 of the current measurement system 100. The procedure shown in FIG. 8 corresponds to the control procedure when the slave unit 111 is in the sleep mode.

  In the procedure of FIG. 8, step S407 in the procedure of FIG. 4 is replaced with step S807. The rest is the same as FIG. For example, in step S807, when the change amount of the main current is equal to or less than the threshold value α (YES in S807), the base unit 106 proceeds to step S409. On the other hand, when the amount of change in the main line current is larger than the threshold value α (NO in S807), the parent device 106 transmits a release signal to the child device 111 to shift to the wake-up mode. In response to the release signal, the slave unit 111 executes the above-described procedure of FIG.

  In FIG. 8, the control procedure when the slave unit 111 is in the sleep mode is shown. Conversely, when the change amount of the main current is small when the slave unit 111 is in the wake-up mode, for example, the threshold α If the value is less than, the base unit 106 can also instruct the transition to the sleep mode. In this case, for example, instead of steps S807 and S408, it is possible to adopt a procedure in which base unit 106 transmits a stop signal when the amount of change in the main line current falls below threshold value α. Correspondingly, the procedure of FIG. 5 can be modified as described in the first embodiment.

[Modification]
FIG. 9 shows a configuration example of a current measurement system in a modification of the first and second embodiments. A current measurement system 100a in FIG. 9 has a slave unit 202 common to the main and branch lines instead of the slave units 102 and 111 for each of the main and branch lines shown in FIG. Other configurations are the same as those in FIG.

  The subunit | mobile_unit 202 has the control part 203 connected by the bus | bath 202a, the memory 204, the communication part 205, and interface part 205a-205c. The main line current measurement data transmitted from the main line current sensor 101 is transmitted to the bus 202a via the interface unit 205a and stored in the memory 204 by the control unit 203. The measurement data of the branch line current transmitted from the branch line current sensor 110 is transmitted to the bus 202a via the interface units 205b and 205c, respectively, and stored in the memory 204 by the control unit 203. Each measurement data stored in the memory 204 is wirelessly transmitted from the communication unit 205 to the parent device 106. The control unit 203 controls the reading / writing of data to / from the memory 204 and the operation of the communication unit 205. The control operation of the control unit 203 corresponds to the control operation of the control units 103 and 112 in the first and second embodiments.

  FIG. 10 is a flowchart illustrating an operation procedure of the current measurement system according to the modification. The operation procedure in FIG. 10 corresponds to the operation procedure in the first embodiment. That is, this is a procedure for controlling transmission of measurement data by the slave unit 202 according to the magnitude of the main current when the slave unit 202 is in the sleep mode.

  First, when the power source of the current measurement system is turned on (S1102), steps S1104 to S111 are executed every time a predetermined time t has elapsed (YES in S1103). First, the slave unit 202 acquires a main current (S1104). Next, when the main current is less than or equal to threshold I (YES in S1106), base unit 106 proceeds to step S1108. On the other hand, when the main current is larger than the threshold value I (NO in S1106), the parent device 106 transmits a release signal to the child device 202, and causes the child device 202 to enter the wake-up mode thereafter (S1107). In response to this, the slave unit 202 stores the measurement data in the memory 204. In step S1108, the slave unit 202 determines whether or not the remaining amount of the memory 204 is equal to or less than a predetermined threshold value β. When the remaining amount of the memory 204 is equal to or greater than the threshold β (YES in S1108), the slave device 202 transmits the measurement data stored in the memory 204 to the master device 106, and clears the memory (S1109). And the subunit | mobile_unit 202 transfers to sleep mode (S1110). On the other hand, when the remaining amount of the memory 204 is less than the threshold β (NO in S1108), the handset 202 shifts to the sleep mode (S1110).

  In step S1111, it is confirmed whether the power is turned off. Until the power is turned off (NO in S1111), the above-described procedures S1103 to S1110 are executed. On the other hand, when the power is turned off (YES in S1111), the master unit 106 and the slave unit 202 end the processing.

  In this way, the slave unit 202 transmits measurement data when a cancel signal is transmitted from the master unit 106 in the sleep mode. By doing so, compared with the case where measurement data is constantly transmitted, the power required for wireless transmission can be saved. Further, in that case, measurement data is transmitted every time the remaining amount of the memory 113 becomes equal to or less than the threshold value β. Therefore, transmission is performed for each measurement data buffered according to the capacity of the memory 113. Therefore, the communication frequency can be further reduced accordingly, and the power required for wireless transmission can be saved.

  In FIG. 10, the procedure corresponding to the second embodiment can be made by substituting the procedure S1106 with a procedure for determining whether or not the change amount of the main current is larger than the threshold value. In the modified example, when the cordless handset 202 is in the wake-up mode, if the current of the main line or the amount of change thereof becomes small, for example, if the value falls below a threshold value, the master device 106 can instruct transmission stop. is there. In this case, for example, instead of steps S1106 and S1107, when the main line current or the amount of change thereof falls below a threshold value, base unit 106 transmits a stop signal to handset 202 and causes handset 202 to enter sleep mode. On the other hand, it is possible to set the procedure so that the mobile device 202 shifts to the wake-up mode in step S1111.

  As described above, according to the present embodiment, it is possible to reduce the useless power required for acquiring and transmitting the measurement data of the branch current according to the main current, so the power consumption of the current measurement system itself is optimized. can do. In the above description, the case where the slave unit and the master unit perform wireless communication is shown. However, even when wired communication is performed, it is possible to save power consumption corresponding to communication. For example, when the slave unit acquires power from the main trunk line or branch line, the power consumption can be reduced. Further, when the slave unit is driven by a battery, the frequency of battery replacement due to battery consumption can be reduced, and convenience is improved.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each means, each step, etc. can be rearranged so that there is no logical contradiction, and a plurality of means, steps, etc. can be combined or divided into one. .

100: current measurement system, 102, 111: slave unit, 106: master unit

Claims (15)

A handset that respectively obtains measurement data of the current of the main line to which power is supplied and the current of the branch line branched from the main line,
Based on the main trunk measurement data transmitted from the slave unit, a master unit that transmits to the slave unit a control signal for causing the slave unit to execute or stop transmission of measurement data of the current of the trunk line; A current measuring system. In claim 1,
The master unit is configured to transmit the measurement data of the branch line current when the main line current exceeds a reference value, or when the main line current is lower than the reference value. Transmitting the control signal for stopping transmission of the measurement data of the current of the trunk line;
Current measurement system. In claim 1,
The base unit has the control signal for executing transmission of measurement data of the current of the main line when the amount of change in the current of the main line exceeds a reference value, or the amount of change in the current of the main line is Transmitting the control signal for stopping the transmission of the measurement data of the current of the main line when the reference value is below,
Current measurement system. In any one of Claims 1 thru | or 3,
The cordless handset has a storage unit for storing the acquired measurement data of the current of the branch line, and on the condition that the remaining amount of the storage unit is equal to or less than a predetermined remaining amount, Sending measurement data to the master unit,
Current measurement system. A communication unit that receives the measurement data transmitted from the slave units that respectively acquire the measurement data of the current of the main line to which power is supplied and the current of the branch line branched from the main line;
Based on the measurement data of the current of the main line, a control unit that controls transmission of a control signal for causing the slave unit to execute or stop transmission of measurement data of the current of the main line;
A parent machine with. In claim 5,
The control unit is configured to transmit the measurement data of the main line current when the main line current exceeds a reference value, or when the main line current is lower than the reference value. Causing the communication unit to transmit the control signal for stopping transmission of the measurement data of the current of the trunk line;
Master machine. In claim 5,
The control unit is configured such that when the amount of change in the main line current exceeds a reference value, the control signal for transmitting measurement data of the current in the main line, or the amount of change in the main line current is Causing the communication unit to transmit the control signal for stopping the transmission of the measurement data of the current of the branch line when it falls below a reference value;
Master machine. Transmits the measurement data of the current of the main line to which power is supplied and the current of the branch line branched from the main line to the main unit collecting the measurement data, and the main unit uses the main line based on the main line current A communication unit that receives a control signal for transmitting or executing transmission of measurement data of current of the branch line,
In response to the control signal, a control unit that causes the communication unit to execute or stop transmission of measurement data of the trunk line;
A handset with In claim 8,
The communication unit, the control signal causes executes transmission of the measurement data of the current of the stems rays transmitted from the base unit when the current of the main trunk line exceeds the reference value or the current of the main trunk line is the reference, for receiving the control signal for stopping the transmission of the measurement data of the current of the stems rays transmitted from said base unit when below a value,
Cordless handset. In claim 8,
The communication unit, the control signal causes executes transmission of the measurement data of the current of the stems rays transmitted from the base unit when the amount of change in current of the main trunk line exceeds the reference value or the current of the main trunk line, the amount of change is for receiving the control signal for stopping the transmission of the measurement data of the current of the stems rays transmitted from said base unit when lower than the reference value,
Cordless handset. In any one of Claims 8 thru | or 10.
A storage unit for storing measurement data of the acquired current of the branch line;
The control unit causes the communication unit to transmit measurement data of the current of the trunk line to the master unit on condition that the remaining amount of the storage unit is equal to or less than a predetermined remaining amount.
Cordless handset. Send the measurement data to the slave units that respectively acquire the measurement data of the current of the main line to which power is supplied and the current of the branch line branched from the main line,
A control signal for causing the slave unit to execute or stop transmission of the measurement data of the main line current to the slave unit based on the main line current is sent to the master unit that receives the measurement data of the main line current To send
Control method of current measurement system. In claim 12,
The control signal for executing transmission of measurement data of the current of the main line when the current of the main line exceeds a reference value, or the current of the main line when the current of the main line falls below the reference value Transmitting the control signal for stopping transmission of measurement data to the slave unit,
Control method of current measurement system. In claim 12,
When the amount of change in the main line current exceeds the reference value, the control signal for transmitting the measurement data of the current in the main line or when the amount of change in the main line current is below the reference value To send the control signal to stop the transmission of the measurement data of the current of the branch line to the slave unit,
Control method of current measurement system. In any of claims 12 to 14,
The branch line current measurement data is stored in the master unit on condition that the remaining amount of the storage unit of the slave unit storing the acquired branch line current measurement data is equal to or less than a predetermined remaining amount. Sent,
Control method of current measurement system.

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