JP2009033467A - Power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the number of connectable terminal devices from being restricted down to less than an upper limit number of actually operable terminal devices, while inhibiting operation of terminal devices in which the sum total of currents consumed by the terminal devices and the line-to-line impedance of a power supply line to a transmission signal exceed their allowable ranges. <P>SOLUTION: When a power supply device A1 receives terminal information including a consumption current and an input impedance from a certain terminal device B1, and if the total sum of currents to be consumed by terminal devices B1-B4 becomes within its allowable range even if this terminal device B1 is operated, and if the line-to-line impedance of the power supply line 1 to the transmission signal is within its allowable range, an operation permission is transmitted to the terminal device B1. Each terminal device B1-B4 is equipped with a switching portion for performing switching between an operation mode for supplying power to its load and communication portion, and a standby mode in which its input impedance to the transmission signal is higher than that in the operation mode and power is supplied to the communication portion, and the switching portion performs switching from the standby mode to the operation mode when the operation permission is obtained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, a power supply device and one or more terminal devices are connected by a power supply line, power is supplied from the power supply device to the terminal device via the power supply line, and transmission is superimposed on the power supply voltage. The present invention relates to a power supply system that enables communication between a power supply device and a terminal device by using a signal.

  Conventionally, as shown in FIG. 9, a power supply device A that applies a power supply voltage to a two-wire power supply line 1 and a load that operates by receiving the power supply voltage are connected to the power supply line 1. A power supply system including one or more terminal devices B (B1 to B10) and capable of communicating between the power supply device A and the terminal device B by using a transmission signal superimposed on the power supply voltage. Proposed. In this type of power supply system, the power supply line 1 is shared for the supply of the power supply voltage and the transmission of the transmission signal, so there is no need to provide a signal line for communication separately from the power supply line 1 (for example, Patent Documents). 1).

  In addition, when using a load that operates by receiving DC power (hereinafter referred to as DC load) in a house or the like, a power adapter that converts AC power (commercial power) AC into DC power is required. If there are a plurality of DC loads, a plurality of power adapters are required, and the connection relationship is complicated. Therefore, a DC voltage can be applied to the DC loads of a plurality of terminal devices B connected to the power supply line 1 by applying a DC voltage from the power supply apparatus A to the power supply line 1. A power supply system is also considered. In this power supply system, since the loads of a plurality of terminal devices B can be operated by a DC voltage from one power supply device A, the connection relationship is simplified compared to the case where a plurality of power supply adapters are used. .

  By the way, in these power supply systems, when a plurality of terminal devices B connected to the power supply line 1 are in operation, the total current consumption of the terminal device B exceeds the allowable range of the power supply device A, or the power supply line If the line impedance for one transmission signal exceeds the allowable range in which communication by the transmission signal is established, there is a possibility that problems such as a decrease in power supply voltage and communication failure may occur. That is, when the sum of the current consumption in the plurality of terminal devices B connected to the power supply line 1 exceeds the upper limit of the current that can be supplied by the power supply device A, the power applied to the power supply line 1 from the power supply device A The voltage may decrease, and communication may not be established if the line impedance for the transmission signal of the power supply line 1 is lower than the lower limit of the line impedance at which communication by the transmission signal is established.

  Specifically, when the upper limit value of the current that can be supplied by the power supply device A is 1200 mA, the nine terminal devices B1 to B9 whose current consumption is 100 mA are already connected as shown in FIG. Even if one terminal device B10 with a current consumption of 100 mA is added, the sum of the current consumption becomes 1000 mA and normal power supply is possible from the power supply device A. However, if one terminal device B10 with a current consumption of 500 mA is added, The sum of the current consumption becomes 1400 mA, and the output voltage from the power supply device A decreases, leading to an abnormal operation of the terminal device B. In addition, if the line impedance for the transmission signal of the power supply line 1 is 80Ω or more, when communication by the transmission signal is established, nine terminal devices B1 to B9 whose input impedance for the transmission signal is 1 kΩ as shown in FIG. Is already connected, even if one terminal device B10 having an input impedance of 1 kΩ is added, the line impedance becomes 100Ω, and communication by transmission signal is established, but one terminal device B10 having an input impedance of 100Ω is established. If added, the line impedance becomes about 52Ω, and communication by the transmission signal is not established.

In order to solve these problems, in general, the type and upper limit number of terminal devices B that can be connected to the power supply line 1 are defined in advance as specifications of the power supply system. If the terminal devices B are connected according to this specification, even if all the terminal devices B are operated, the sum of the current consumption of the terminal devices B and the line impedance for the transmission signal of the power supply line 1 do not exceed the allowable range. .
JP 11-298383 A

  However, as described above, when the type and upper limit number of terminal devices B that can be connected to the power supply line 1 are specified in advance as the specifications of the power supply system, the specifications are determined with some allowance for current consumption and input impedance. In many cases, as a result, the upper limit number in the specification is defined to be significantly smaller than the upper limit number of the terminal devices B that can actually operate.

  The present invention has been made in view of the above-mentioned reasons, while prohibiting the operation of the terminal device such that the total current consumption of the terminal device and the line impedance to the transmission signal of the power supply line exceed the allowable range. An object of the present invention is to provide a power supply system in which the number of connectable terminal devices is less than the upper limit number of terminal devices that can actually be operated and is not limited.

  According to the first aspect of the present invention, a power supply device for applying a power supply voltage to the power supply line, one or more terminal devices each having a load that operates by receiving the power supply voltage and connected to the power supply line, A management device connected to the supply line and managing whether or not the terminal device is in operation, and can communicate between the power supply device, the terminal device, and the management device by using a transmission signal superimposed on the power supply voltage. In the power supply system, the terminal device includes a terminal communication unit connected to the power supply line, an operation mode for supplying power to the load and the terminal communication unit, and an input impedance for the transmission signal higher than the operation mode. A switching unit that switches between a standby mode for supplying power, and terminal information that is used to identify the current consumption in the operation mode and the input impedance for the transmission signal. The management device requests operation permission by transmitting to the management device from the end communication unit, and the management device uses the management communication unit connected to the power supply line and the terminal information of the terminal device operating in the operation mode as the operating terminal information. A storage unit for storing, and a determination unit for determining whether or not the one terminal device is operable using the terminal information and the operating terminal information when the terminal information is received from the one terminal device by the management communication unit; And the determination unit includes the total current consumption of the terminal device within the allowable range of the power supply device even when the one terminal device is operated in the operation mode, and the line impedance with respect to the transmission signal of the power supply line is When it falls within the allowable range where communication by the transmission signal is established, it is determined that the operation is possible, and the operation permission is transmitted from the management communication unit to the one terminal device, and the switching unit is in a standby state without the operation permission. Mode and , And switches to the active mode operation permission is obtained.

  According to this configuration, the terminal device operates in the standby mode in which the input impedance to the transmission signal is higher than that in the operation mode and supplies power to the terminal communication unit in a state where the operation permission is not obtained. It operates in an operation mode for supplying power to the terminal communication unit. That is, if the terminal device is simply connected to the power supply line, the terminal device operates in the standby mode, so that the total current consumption of the terminal device is greatly increased or the line impedance to the transmission signal of the power supply line is increased. The total current consumption of the terminal device is within the allowable range of the power supply device even when the terminal device is operated in the operation mode in the determination unit of the management device. When it is determined that the line impedance with respect to the transmission signal falls within an allowable range in which communication by the transmission signal is established, the terminal device operates in the operation mode by transmitting an operation permission from the management device. Therefore, if the terminal device is operated in the operation mode, if the total current consumption of the terminal device exceeds the allowable range, or the line impedance to the transmission signal of the power supply line exceeds the allowable range, this terminal device As a result, the operation of the terminal device in which the total current consumption of the terminal device and the line impedance with respect to the transmission signal of the power supply line exceed the allowable range can be prohibited. . Moreover, the management device determines whether or not the terminal device can be operated using the terminal information and the operating terminal information, and the terminal device can be connected to the power supply line as the specification of the power supply system as in the conventional example. Therefore, the number of connectable terminal devices is not limited to be smaller than the upper limit number of terminal devices that can actually be operated.

  According to a second aspect of the present invention, in the first aspect of the invention, the power supply device applies a DC voltage as the power supply voltage to the power supply line.

  According to this configuration, since a DC voltage can be supplied from one power supply device to a plurality of terminal devices connected to the power supply line, a power supply adapter for supplying DC power is provided for each terminal device. The connection relationship is simplified compared to the case of using them individually.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the terminal information includes a current consumption in the terminal device and an input impedance for the transmission signal.

  According to this configuration, since the terminal information includes the current consumption in the terminal device and the input impedance for the transmission signal, it is not necessary to previously register the current consumption and input impedance of each terminal device in the management device. It is also possible to support new terminal devices developed after the start of use.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the terminal information includes a priority set for each of the terminal devices, and the determination unit operates in the operation mode. If it is determined that the one terminal device can be operated by stopping the operation of another terminal device having a lower priority than the one terminal device among the other terminal devices, the other terminal device After canceling the operation permission, the operation permission is transmitted to the one terminal device.

  According to this configuration, since the determination unit determines whether or not to issue the operation permission including the already permitted operation of the terminal device according to the priority, the priority is determined regardless of the order in which the operation permission is requested. High-priority terminal devices can be preferentially operated.

  According to a fifth aspect of the present invention, in the second aspect of the present invention, a plurality of the power supply devices are provided, and the allowable range of the power supply device is determined based on a sum of currents that can be supplied from the plurality of power supply devices. It is characterized by determining.

  According to this configuration, by using a plurality of power supply devices, the allowable range of the power supply device can be expanded, and a larger number of terminal devices can be operated than in the case of a single power supply device. .

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, at least one of the plurality of power supply devices also serves as the management device.

  According to this configuration, it is not necessary to provide a management device separately from the power supply device, and there is an advantage that the system configuration is simplified.

  The invention of claim 7 is the invention according to any one of claims 1 to 6, wherein the management device includes a display unit for displaying information based on the operating terminal information in the storage unit. To do.

  According to this configuration, since information based on the operating terminal information is displayed on the display unit, the user can use this information to determine how many terminal devices can be operated within an allowable range. Can know.

  The present invention operates in a standby mode in which the terminal device has a higher input impedance to the transmission signal than the operation mode and supplies power to the terminal communication unit in a state where the operation permission is not obtained. It operates in the operation mode that supplies power to the unit. Even if the management device operates the terminal device in the operation mode, the total current consumption of the terminal device is within the allowable range of the power supply device, and the line impedance with respect to the transmission signal of the power supply line establishes communication by the transmission signal. When the determination unit determines that it falls within the allowable range, the operation permission is transmitted to the terminal device, so that the total current consumption of the terminal device and the line impedance with respect to the transmission signal of the power supply line exceed the allowable range. There is an effect that the operation of the terminal device can be prohibited. Moreover, since the management device determines whether or not the terminal device can be operated using the terminal information and the operating terminal information, the number of connectable terminal devices is limited to be less than the upper limit number of terminal devices that can actually be operated. It will never be done.

(Embodiment 1)
As shown in FIG. 1, the power supply system according to the present embodiment includes power supply devices A1 and A2 that apply a DC voltage as a power supply voltage to a two-wire power supply line 1 (hereinafter referred to as “ A ”) and a load 2 (see FIG. 2A) that operates by receiving a power supply voltage (DC voltage), and a plurality of (here, four) terminals connected in parallel to the power supply line 1 And devices B1, B2, B3, and B4 (hereinafter referred to as “B” when individuals are not particularly distinguished). Here, a plurality (two) of power supply devices A1 and A2 are connected in parallel to the power supply line, and one of these power supply devices A1 is connected to the power supply line 1 and the terminal device B is in operation. It also functions as a management device that manages whether or not. Note that the power supply voltage supplied by the power supply device A is not limited to a DC voltage.

  As shown in FIG. 2A, the terminal device B communicates with the power supply device A via the power supply line 1 by using a transmission signal connected to the power supply line 1 and superimposed on the power supply voltage. Possible communication unit (terminal communication unit) 3, standby connection unit 4 having a relatively high impedance to the transmission signal, operation connection unit 5 having a lower impedance to the transmission signal than standby connection unit 4, and standby connection A first changeover switch SW1 that connects one of the unit 4 and the operating connection unit 5 to the power supply line 1, a power supply unit 6 that converts a power supply voltage into a predetermined voltage for operating the communication unit 3 and the load 2, and a power supply And a second changeover switch SW2 for switching whether or not the load 2 is connected to the unit 6.

  Here, the operating connection unit 5 is connected to the output side of the standby connection unit 4 (the side opposite to the first changeover switch SW1), and the power supply unit 6 is connected to the output side of the operating connection unit 5 (with the standby connection unit 4). Connected to the other side). Therefore, in a state where the standby connection unit 4 is connected to the power supply line 1 by the first changeover switch SW1, the power supply unit 6 is connected via the operation connection unit 5, the standby connection unit 4 and the first changeover switch SW1. On the other hand, in a state where the operating connection unit 5 is connected to the power supply line 1 by the first changeover switch SW1, the power supply unit 6 connects the operating connection unit 5 and the first changeover switch SW1. To the power supply line 1. The output end of the power supply unit 6 is connected to the communication unit 3 and is connected to the load 2 via the second changeover switch SW2, and thus the load 2 is connected to the power supply unit 6 by the second changeover switch SW2. In the state, power is supplied to both the communication unit 3 and the load 2, while in the state where the load 2 is disconnected from the power source unit 6 by the second changeover switch SW2, the communication unit 3 is supplied with power but the load 2 No power is supplied and current consumption is kept low.

  Here, the first change-over switch SW1 and the second change-over switch SW2 have an operation mode in which power is supplied to both the load 2 and the communication unit 3, and the input impedance of the terminal device B with respect to the transmission signal is higher than that in the operation mode, and the communication unit 3 is configured to switch between two operation modes, i.e., a standby mode in which power is supplied to 3. That is, the terminal device B operates in either a standby mode with high input impedance and low current consumption or an operation mode with low input impedance and high current consumption. Here, the state in which the first changeover switch SW1 connects the standby connection unit 4 to the power supply line 1 and the second changeover switch SW2 disconnects the load 2 from the power supply unit 6 is the standby mode, and the first changeover switch SW1 is The operation mode is a state in which the operating connection unit 5 is connected to the power supply line 1 and the second changeover switch SW2 connects the load 2 to the power supply unit 6. As an example of the terminal device B, in the standby mode, the current consumption is 1 mA and the input impedance is 50 kΩ, whereas in the operation mode, the current consumption is 50 mA and the input impedance is 10 kΩ.

  The first changeover switch SW1 and the second changeover switch SW2 are configured to switch between a standby mode and an operation mode in accordance with a control signal from the communication unit 3, and the communication unit 3 has a power supply device A1 whose operation permission described later is a management device. In the state not obtained, the standby mode is set, and when the operation permission is obtained, a control signal is output so as to switch to the operation mode.

  The terminal device B having the above configuration manages terminal information (see FIG. 4) including the terminal type indicating the type of the load 2 included in the terminal device B, the current consumption in the operation mode, and the input impedance for the transmission signal from the communication unit 3. By transmitting to the power supply device A1 as a device, the power supply device A1 is requested to permit operation. In the present embodiment, when the terminal device B is connected to the power supply line 1, the terminal device B requests the operation permission once. If the operation permission cannot be obtained at this time, the terminal device B requests the operation permission again after a predetermined time (hereinafter, referred to as “operation permission”). "Reconfirmation process"). This reconfirmation process is repeated every predetermined time until an operation permission is obtained.

  For example, as shown in FIG. 2B, the standby connection unit 4 is configured to have a high impedance with respect to a transmission signal by connecting a resistor R1 in series to a parallel circuit of an inductor L1 and a capacitor C1. . Here, the standby connection unit 4 forms part of the power supply path to the communication unit 3 in the standby mode, and does not form a power supply path to the load 2, so that it is supplied to the load 2. Such a large current does not flow to the standby connection portion 4, and a small inductor having a small wire diameter can be used as the inductor L1. On the other hand, the connection part 5 at the time of operation is composed of, for example, a transistor, a diode, or the like, and ensures a high input impedance to the extent that communication by a transmission signal is established even in the operation mode.

  As shown in FIG. 3, the power supply device A stores a communication unit (management communication unit) 7 that is connected to the power supply line 1 and communicates with the terminal device B, and terminal information received from the terminal device B. The storage unit 8 and a calculation unit (determination unit) 9 that determines whether or not the terminal device B that is the transmission source of the terminal information is operable when the terminal information is received from the terminal device B. As illustrated in FIG. 4, the storage unit 8 includes a terminal management table 8 a that stores terminal information received from each terminal device B separately for each terminal type, current consumption, and input impedance. In the terminal management table 8a, the terminal information of the terminal device B operating in the operation mode is managed as the operating terminal information separately from the terminal information of the other terminal devices B. The arithmetic unit 9 stores the terminal information in the storage unit 8 when the terminal information is received from the terminal device B, and the terminal device B that is the transmission source of the terminal information can be operated using the terminal information and the operating terminal information. Determine whether or not. Furthermore, the power supply device A includes a connection unit 10 that includes a high impedance circuit configured by a choke coil and is connected to the power supply line 1, a power conversion unit 11 that converts an AC voltage from the commercial power supply AC into a DC voltage, A display unit 12 connected to the calculation unit 9 and capable of displaying characters and the like is provided.

  Here, when receiving the terminal information from the terminal device B, the arithmetic unit 9 calculates the sum of the current consumption of the terminal device B and the power supply line 1 when the terminal device B that has transmitted the terminal information is operated in the operation mode. Is calculated using the received terminal information and the operating terminal information. That is, the current consumption in the received terminal information is calculated by adding the current consumption in the received terminal information to the total current consumption of the terminal device B already operating in the operation mode, and the input in the received terminal information. The line impedance of the power supply line 1 is calculated by combining the impedance with the input impedance of the terminal device B that is already operating in the operation mode. When the calculated sum of the consumed currents is within the allowable range of the power supply device A and the calculated line impedance is within the allowable range where communication by the transmission signal is established, the transmission source of the terminal information The terminal device B is determined to be operable, and the operation permission is transmitted from the communication unit 7 to the terminal device B that is the transmission source of the terminal information. On the other hand, if any one of the calculated sum of current consumption and line impedance is out of the allowable range, it is determined that the terminal device B that is the terminal information transmission source cannot be operated, and the operation permission is not issued. The operation non-permission is transmitted to the terminal device B that is the terminal information transmission source.

  In the present embodiment, among the plurality (two) of power supply devices A1 and A2, which power supply device A operates as a management device is a dip switch (not shown) provided for each power supply device A. Is set arbitrarily. In place of the DIP switch, setting means for automatically setting the power supply device A that operates as the management device by performing communication (negotiation) between the power supply devices A using the communication ID when each power supply device A is activated. May be included in each power supply device A.

  The power supply device A2 that does not operate as the management device notifies the power supply device A1 that operates as the management device of the power supply information including the current that can be supplied by itself and the input impedance for the transmission signal when the power supply device A2 is activated or connected to the power supply line 1. In the power supply device A1, the power supply information notified from the power supply device A2 is used to determine whether or not the terminal device B in the arithmetic unit 9 can be operated. Specifically, the sum of the current that can be supplied by the power supply device A1 and the current that can be supplied by the power supply device A2 is set as the allowable range of the power supply device A described above, and the input impedance of the power supply device A1 to the transmission signal of the power supply device A1 is A combination of input impedances for transmission signals is reflected in the above-described allowable range of line impedance. Normally, as the number of connected power supply devices A increases, the current that can be supplied as the whole power supply device A increases, and the line impedance of the power supply line 1 decreases. In addition, when the power supply devices A1 and A2 are individually provided for each room in a house or the like, power is supplied to the terminal device B in each room from the power supply devices A1 and A2 in each room in principle. Management is performed so that power is supplied from the power supply device A2 in the other room to the terminal device B in the power supply device A1 only when the total current consumption of the terminal device B exceeds the allowable range of the power supply device A1 in this room. The power supply device A1 as a device may adjust the power distribution.

  The display unit 12 of the power supply device A1 as the management device displays information such as the operating state of the terminal device B based on the operating terminal information in the storage unit 8. Here, the number of terminal devices B operating in the operation mode, terminal type, current consumption, input impedance, and the like are displayed. That is, the information displayed on the display unit 12 can notify the user of how many terminal devices B can be operated within the allowable range. You may make it display on the display part 12 the terminal classification, the number, etc. of the terminal device B which can be newly operate | moved within the tolerance | permissible_range.

  Next, the operation of the power supply system of this embodiment will be described with reference to the operation flowchart of the terminal device B shown in FIG. 5, the operation flowchart of the power supply device A1 (management device) shown in FIG. 6, and the sequence diagram of FIG. To do.

  When the terminal devices B1 and B2 are connected to the power supply line 1 and start operating in the standby mode (S10), the terminal devices B1 and B2 communicate with the power supply device A1 by supplying power to the communication unit 3 via the standby connection unit 4. Start. At this time, the terminal devices B1 and B2 notify the power supply device A1 of terminal information as shown in FIG. 7 (S11).

  When receiving the terminal information (S20), the power supply device A1 stores the received terminal information in the terminal management table 8a of the storage unit 8 (S21), and the calculation unit 9 calculates the total current consumption and the power supply as described above. The line impedance for the transmission signal of line 1 is calculated (S22). If the calculated sum of the consumed currents is within the allowable range (S23: OK) and the calculated line impedance is within the allowable range (S24: OK), the terminal information is transmitted as shown in FIG. Operation permission is transmitted from the communication unit 7 to the original terminal device B1 (S25), and the terminal information reception waiting state (S26) is entered. At this time, the terminal information of the terminal device B1 that has given the operation permission is stored in the storage unit 8 as the operating terminal information.

  When the terminal device B1 receives the notification from the power supply device A1 (S12), the terminal device B1 determines whether or not the notification is permitted for operation (S13). Since the operation is permitted in the example of FIG. 7 (S13: OK), the switching is performed. The operation mode is switched from the standby mode to the operation mode by the unit (S14, S15).

  On the other hand, when any one of the calculated sum of the consumed currents and the line impedance falls outside the allowable range (S23: NG or S24: NG), the power supply device A1 is the terminal device that is the transmission source of the terminal information An operation non-permission is transmitted from the communication unit 7 to B2 (S27), and the terminal information reception waiting state (S26) is entered.

  When the terminal device B2 receives the notification from the power supply device A1 (S12), the terminal device B2 determines whether or not the notification is permitted to operate (S13), and is not permitted in the example of FIG. 7 (S13: NG). The predetermined time until the reconfirmation process is performed is counted (S16), and the terminal information is notified again to the power supply device A1 after the predetermined time has elapsed (S11). Here, when any terminal device B is removed from the power supply line 1 until the predetermined time elapses, the terminal device B2 can be operated in the operation mode. An operation permission is issued to the device B2.

  According to the power supply system of the present embodiment described above, since the terminal device B operates in the standby mode only when the terminal device B is connected to the power supply line 1, the total current consumption increases significantly. In addition, the line impedance to the transmission signal of the power supply line 1 is not significantly reduced. Then, even if the terminal device B is operated in the operation mode in the arithmetic unit 9 of the power supply device A1, the total current consumption of the terminal device B exceeds the allowable range of the power supply device A, or a line for the transmission signal of the power supply line 1 Only when it is determined that the inter impedance does not exceed the allowable range, the terminal device B receives the operation permission and shifts to the operation mode. Therefore, the operation of the terminal apparatus B is prohibited such that the total current consumption of the terminal apparatus B and the line impedance for the transmission signal of the power supply line 1 exceed the allowable range. Further, whether or not the terminal device B can be operated is determined every time there is a request for operation permission from the terminal device B, so the number of connectable terminal devices B is larger than the maximum number of terminal devices B that can actually be operated. However, there is no limit.

  In the above embodiment, the terminal information including the current consumption and the input impedance in the terminal device B has been described. However, only the terminal type is included in the terminal information, and the current consumption and the input impedance of each terminal device B are determined as the terminal type. The terminal type may be collated on the power supply device A1 side to identify the current consumption and the input impedance of the terminal device B by pre-registering with the power supply device A1 as a management device in association with each other. However, when the terminal information includes the current consumption and the input impedance as in the above-described embodiment, there is an advantage that it can be applied to a new terminal device B developed after the start of use of the power supply device A1. That is, even for the terminal device B whose current consumption and input impedance are not registered in the power supply device A1, it is possible to identify the current consumption and input impedance in the power supply device A1.

  When the power supply device A applies an AC voltage as a power supply voltage to the power supply line 1, the input impedance of the terminal device B in the frequency band of the power supply voltage is lower in the operation mode than in the standby mode, and in the frequency band of the transmission signal It is necessary to configure the standby connection unit 4 and the operating connection unit 5 so that the input impedance of the terminal device B is higher in the standby mode than in the operating mode.

(Embodiment 2)
The power supply system of this embodiment includes the priority set for each terminal device B in the terminal information transmitted to the power supply device A1 (management device) when the terminal device B requests operation permission. The point which judges operation permission using the said priority in A1 is different from the power supply system of Embodiment 1. The priority here determines the priority for operating the terminal device B in the operation mode. For example, the priority of the terminal device B1 is “1” and the priority of the terminal device B2 is “2”. In this case, the terminal device B1 operates with priority over the terminal device B2.

  When receiving the terminal information from the terminal device B, the arithmetic unit 9 of the power supply device A determines whether or not to issue the operation permission including the already permitted operation of the terminal device B according to the priority in the terminal information. . That is, the calculation unit 9 is not able to operate the terminal device B that is the transmission source of the terminal information in a state where all the terminal devices B that are operating in the operation mode are operated, but among the terminal devices B that are operating in the operation mode, If it is determined that the terminal device B that is the transmission source of the terminal information can be operated by stopping the operation in the operation mode of the terminal device B that has a lower priority than the terminal device B that is the transmission source of the device B, After canceling the operation permission of the lower terminal device B, the operation permission is transmitted to the terminal device B that is the transmission source of the terminal information. If it is determined that the terminal device B that is the terminal information transmission source can be operated even when all the terminal devices B that are operating in the operation mode are operated, the terminal device B that is the transmission source of the terminal information is the same as in the first embodiment. Notify operation permission.

  Further, when the operation permission is canceled in the power supply device A1 and the operation non-permission is notified, the operation mode of the terminal device B is switched from the operation mode to the standby mode by the first changeover switch SW1 and the second changeover switch SW2. When the operation mode is switched to the standby mode, the terminal device B transmits terminal information indicating that the operation mode is switched to the standby mode from the communication unit 2 to the power supply device A1.

  In the following, the priority (here "1") of the terminal device B1 newly connected to the power supply line 1 is the priority of the terminal device B2 that is already connected to the power supply line 1 and is operating in the operation mode. The operation of the present embodiment when it is higher than (here “2”) will be described with reference to the sequence diagram shown in FIG.

  When the terminal device B1 is connected to the power supply line 1 and starts operating in the standby mode, the terminal device B1 notifies the power supply device A1 as a management device of terminal information.

  The power supply device A1 notified of the terminal information from the terminal device B1 is limited to the terminal device B having a priority higher than that of the terminal device B1, and the current consumption of the terminal device B when the terminal device B1 is operated in the operation mode. The sum and the line impedance with respect to the transmission signal of the power supply line 1 are calculated, and it is determined whether or not all the terminal devices B that are higher than the priority of the terminal device B1 can be operated in the operation mode. If it is determined that the terminal device B1 is operable, then the terminal device B1 is operated including not only the terminal device B having a priority higher than that of the terminal device B1 but also the terminal device B2 having a lower priority than the terminal device B1. The sum of the current consumption of the terminal device B when operated in the mode and the line impedance for the transmission signal of the power supply line 1 are calculated to determine whether all the terminal devices B can be operated in the operation mode. At this time, if it is determined that the operation cannot be performed, the terminal device B2 having a low priority is notified of the operation not permitted in order to cancel the operation permission, and the operation mode of the terminal device B2 is switched from the operation mode to the standby mode. After confirming the terminal information from the terminal device B2, the operation permission is notified to the terminal device B1 having a high priority. Note that the terminal information of the terminal device B2 whose operation permission has been canceled is handled in the storage unit 8 as terminal information for which operation permission is being requested, not operating terminal information.

  According to the power supply system described above, operation permission / connection disapproval is determined according to priority, including canceling the operation permission of the terminal device B that has already been permitted to operate. Regardless, the specific terminal device B can be preferentially operated in the operation mode. For example, when the terminal device B related to lighting control and the terminal device B related to power measurement are mixed and connected to the power supply line 1, if the priority of the terminal device B related to lighting control is set high, the lighting control Terminal device B can be operated with priority over terminal device B related to power measurement.

  Other configurations and functions are the same as those of the first embodiment.

1 is a system configuration diagram showing a configuration of Embodiment 1 of the present invention. (A) is a block diagram which shows the structure of a terminal device same as the above, (b) is a circuit diagram of a connection part at the time of standby. It is a block diagram which shows the structure of a power supply device same as the above. It is explanatory drawing which shows the terminal management table of a memory | storage part same as the above. It is a flowchart which shows operation | movement of a terminal device same as the above. It is a flowchart which shows operation | movement of the management apparatus same as the above. It is a sequence diagram which shows the operation example same as the above. It is a sequence diagram which shows the operation example of Embodiment 2 of this invention. It is a system configuration | structure figure which shows a prior art example.

Explanation of symbols

1 Power supply line 2 Load 3 Communication unit (terminal communication unit)
7 Communication Department (Management Communication Department)
8 Storage unit 9 Calculation unit (determination unit)
12 Display unit A1 Power supply (management device)
A2 power supply device B1 to B4 terminal device SW1 first changeover switch (switching unit)
SW2 Second changeover switch (switching part)

Claims (7)

  A power supply device for applying a power supply voltage to the power supply line; one or a plurality of terminal devices each having a load that operates by receiving the power supply voltage and connected to the power supply line; and a terminal device connected to the power supply line A power supply system capable of communicating between the power supply device, the terminal device, and the management device by using a transmission signal superimposed on the power supply voltage. The terminal device includes a terminal communication unit connected to the power supply line, an operation mode for supplying power to the load and the terminal communication unit, and a standby mode for supplying power to the terminal communication unit with an input impedance higher than the operation mode for the transmission signal. A switching unit for switching, and terminal information used for identification of current consumption in the operation mode and input impedance for the transmission signal is managed from the terminal communication unit. The management device, the management communication unit connected to the power supply line, a storage unit that stores the terminal information of the terminal device operating in the operation mode as the operating terminal information, A determination unit configured to determine whether the one terminal device is operable using the terminal information and the operating terminal information when the terminal information is received from the one terminal device by the management communication unit; Even if the one terminal device is operated in the operation mode, the sum of the current consumption of the terminal device is within the allowable range of the power supply device, and the line impedance to the transmission signal of the power supply line is established by the transmission signal. If it is within the permissible range, it is determined that the operation is possible, and the operation permission is transmitted from the management communication unit to the one terminal device. Obtained Power supply system, characterized in that switching to the active mode.   The power supply system according to claim 1, wherein the power supply device applies a DC voltage as the power supply voltage to the power supply line.   The power supply system according to claim 1, wherein the terminal information includes current consumption in the terminal device and input impedance for the transmission signal.   The terminal information includes a priority set for each of the terminal devices, and the determination unit is another terminal having a lower priority than the one terminal device among the terminal devices operating in the operation mode. If it is determined that the one terminal device can be operated by stopping the operation of the device, the operation permission is transmitted to the one terminal device after canceling the operation permission for the other terminal device. The power supply system according to any one of claims 1 to 3.   The said power supply device is provided with two or more units | sets, The said management apparatus determines the said tolerance | permissible_range of a power supply device based on the sum total of the electric current which can be supplied from the said several power supply device. Power supply system.   6. The power supply system according to claim 5, wherein at least one of the plurality of power supply devices also serves as the management device.   The power supply system according to claim 1, wherein the management device includes a display unit that displays information based on the operating terminal information in the storage unit.

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