JP2009165247A - Power supply system and its power supply unit - Google Patents

Power supply system and its power supply unit Download PDF

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Publication number
JP2009165247A
JP2009165247A JP2007341327A JP2007341327A JP2009165247A JP 2009165247 A JP2009165247 A JP 2009165247A JP 2007341327 A JP2007341327 A JP 2007341327A JP 2007341327 A JP2007341327 A JP 2007341327A JP 2009165247 A JP2009165247 A JP 2009165247A
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power supply
current
output
unit
dc
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JP2007341327A
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Japanese (ja)
Inventor
Akihiro Kikuchi
Tadashi Matsumoto
Kenji Nakakita
Kiyotaka Takehara
Yoshihiro Tanigawa
賢二 中北
正 松本
清隆 竹原
彰洋 菊池
嘉浩 谷川
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Panasonic Electric Works Co Ltd
パナソニック電工株式会社
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Abstract

Even when a plurality of power supply devices are arranged apart via a power supply line, the output current of each power supply device is balanced.
Power supply to a DC device 102 is performed by a plurality of power supply devices 10a to 10c connected in parallel at positions apart from a DC supply line Wdc. Each of the power supply devices 10a to 10c includes a power supply circuit unit 11 that can adjust the output voltage, a current detection unit 12 that detects an output current of the power supply circuit unit 11, and a communication function that communicates with the other power supply devices 10a to 10c. Part 14. Furthermore, the current calculation part 15 which acquires the output current of each power supply device 10a-10c through the communication function part 14, and calculates the average value of the output current of all the power supply devices 10a-10c, and the electric current detected by the current detection part 12 are And an output control unit 16 for instructing the output voltage of the power supply circuit unit 11 so that the average value calculated by the current calculation unit 15 is obtained.
[Selection] Figure 1

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system that operates by connecting a plurality of power supply devices attached to a building in parallel when supplying power to a device arranged mainly in a building such as a house, a store, or an office building, and the power supply device Is.

  2. Description of the Related Art Conventionally, a technique of operating a plurality of power supply devices connected in parallel for the purpose of compensating for a shortage of power supply capacity or improving the reliability of the power supply is known. The latter technique is called parallel redundant operation, but in the following, both are referred to as parallel operation.

  In parallel operation, multiple power supply units are connected in parallel, so if there is a variation in the output voltage of each power supply unit, the power supply unit with the higher output voltage will supply more load current. On the other hand, a problem arises in that the current flows backward in the power supply device having the lower output current of the output voltage. In other words, when multiple power supply devices are connected in parallel, the load current supplied by each power supply device cannot be balanced due to variations in output voltage, and the output current is allowed in some power supply devices. If the maximum value is exceeded, the stress of the power supply device may increase, and other power supply devices may cause a failure due to the backflow of current.

  In the case where a plurality of power supply devices are concentrated in one place, two types of technologies are mainly employed as a technology for solving this type of problem.

  One technique is to insert a resistor in the power supply path to the load in each power supply device and absorb the voltage difference of the output voltage of the power supply device with the resistance. In the power supply device having this configuration, the voltage-current characteristic is inclined (the resistance corresponding to this inclination is called “gradient resistance”), and the output voltage of the power supply device is balanced by the inclination resistance. (For example, refer to Patent Document 1).

The other technique is to insert a backflow prevention diode in the power supply path to the load in each power supply device (see, for example, Patent Document 2).
JP 2007-159227 A JP-A-4-316110

  However, when the locations of the plurality of power supply devices are distributed without being concentrated in one place, power supply lines are interposed between the power supply devices. When power is supplied, even when the output voltages of the power supply devices are equal, the output current of the power supply device may vary. In other words, an imbalance may occur in the output currents of a plurality of power supply devices, resulting in inconveniences such as the lifetime of some power supply devices becoming extremely shorter than other power supply devices.

  The present invention has been made in view of the above reasons, and its purpose is to balance the output current of each power supply device even when a plurality of power supply devices are arranged apart via a power supply line. An object of the present invention is to provide a power supply system and a power supply apparatus that can be used.

  The invention of claim 1 is a power supply system for supplying to a DC device driven by DC power by operating a plurality of power supply devices connected to each other via a DC supply line in parallel. Each power supply device includes a power supply circuit unit that can output DC power and adjust an output voltage, a current detection unit that detects an output current of the power supply circuit unit, and a communication function unit that communicates with other devices. Furthermore, the current calculation unit that obtains the output current of each power supply device through the communication function unit and calculates the average value of the output current of all the power supply devices, and the current detected by the current detection unit becomes the average value calculated by the current calculation unit And an output control unit for instructing the output voltage of the power supply circuit unit.

  According to a second aspect of the present invention, in the first aspect of the invention, the output control unit includes: a current comparison unit that compares an output current in the power supply device with an average value calculated by the current calculation unit; an output current and an average value; And a voltage command unit for controlling the output voltage of the power supply circuit unit so as to raise the output current to an average value for the power supply device having the smallest output current among the power supply devices having different values.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the current calculation unit is provided in each power supply device.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, a management device capable of communicating with the power supply device is provided, and the current calculation unit is provided in the management device.

  According to a fifth aspect of the present invention, there is provided a power supply device for use in the power supply system according to any one of the first to fourth aspects, wherein the power supply circuit unit is configured to output DC power and adjust an output voltage, and a power supply circuit Current detection unit that detects the output current of the unit, communication function unit that communicates with other devices, and obtains the output current of other power supply devices through the communication function unit, and calculates the average value of the output currents of all power supply devices And an output control unit for instructing the output voltage of the power supply circuit unit so that the current detected by the current detection unit becomes an average value calculated by the current calculation unit. The output current at the current calculation unit is compared with the average value calculated by the current calculation unit, and the output current is raised to the average value when the output current is the smallest among the power supply devices in which the output current and the average value are different Control the output voltage of the power circuit And having a that voltage command unit.

  According to the configuration of the first aspect of the present invention, when a plurality of power supply devices are connected via a DC supply line (power supply line) and operated in parallel, an average value of output currents of all the power supply devices is obtained. Since the output voltage of the power supply circuit unit provided in each power supply device is adjusted so that the output current of each power supply device becomes an average value, the output current of each power supply device can be balanced as a result. The burden on the device can be averaged. As a result, it is possible to prevent an extreme difference in the lifetime of the power supply device.

  According to the configuration of the invention of claim 2, among the power supply devices in which the output current of the power supply circuit unit is not the average value, the output current is brought close to the average value by raising the output voltage in the power supply device having the minimum output current. It is possible to reduce the output current of the power supply device having the maximum output current while securing the current required to supply the DC device. That is, the burden is reduced in the power supply device that has caused the greatest burden. If there is a power supply device in which the output current of the power supply circuit section does not reach the average value even if the output voltage is raised by one power supply device, the output of all the power supply devices is finally obtained by repeating the same process. The current becomes equal. After obtaining the average value of the output current once, adjust the output voltage of all the power supply units to obtain the output current anew, or adjust the output voltage of one power supply unit to determine the average value of the output current again Can be selected, but the latter is easier to cope with load fluctuations.

  According to the configuration of the invention of claim 3, by providing the current calculation unit in each power supply device, it is possible to make the system configuration of only the power supply device without providing any other management device.

  According to the configuration of the invention of claim 4, by providing the current calculation unit in the management device, a plurality of power supply devices can be managed in a centralized manner.

  According to the configuration of the fifth aspect of the invention, the same effect as in the first and second aspects can be obtained.

(Basic configuration)
Although the embodiment described below is described assuming a detached house as a building to which the present invention is applied, it does not preclude applying the technical idea of the present invention to an apartment house. FIG. 3 shows the overall configuration of a power supply system to which this embodiment is applied. As shown in FIG. 3, the house H is provided with a DC power supply unit (power supply unit) 101 that outputs DC power, and a DC device 102 as a load driven by the DC power. Direct current power is supplied to the direct current device 102 through the direct current supply line Wdc connected to the output end of the direct current 101. A current flowing through the DC supply line Wdc is monitored between the DC power supply unit 101 and the DC device 102. When an abnormality is detected, power is supplied from the DC power supply unit 101 to the DC device 102 on the DC supply line Wdc. A DC breaker 114 is provided for limiting or blocking the current.

  The DC supply line Wdc is used as both a DC power supply path and a communication path, and is connected to the DC supply line Wdc by superimposing a communication signal for transmitting data on a DC voltage using a high-frequency carrier wave. Enables communication between devices. This technique is similar to a power line carrier technique in which a communication signal is superimposed on an AC voltage in a power line that supplies AC power.

  The DC supply line Wdc is connected to the home server 116 via the DC power supply unit 101. The in-home server 116 is a main device for constructing a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem constructed by the DC device 102 in the home network.

  In the example shown in the drawing, as an subsystem, an illumination system comprising an information equipment system K101 comprising an information-system DC device 102 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination system DC equipment 102 such as a lighting fixture. K102, K105, an intercom system K103 including a DC device 102 for handling visitors and monitoring intruders, a residential alarm system K104 including a DC device 102 for an alarm system such as a fire detector, and the like. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The above-described DC breaker 114 is provided in association with a subsystem. In the illustrated example, four DCs are associated with the information equipment system K101, the lighting system K102 and the intercom system K103, the house alarm system K104, and the lighting system K105. A breaker 114 is provided. When a plurality of subsystems are associated with one DC breaker 114, a connection box 121 for dividing the system of the DC supply line Wdc is provided for each subsystem. In the illustrated example, a connection box 121 is provided between the illumination system K102 and the intercom system K103.

  As the information equipment system K101, there is provided an information equipment system K101 composed of a DC equipment 102 connected to a DC outlet 131 arranged in advance in the house H (constructed when the house H is constructed) in the form of a wall outlet or a floor outlet.

  The lighting systems K102 and K105 include a lighting system K102 composed of a lighting device (DC device 102) arranged in advance in the house H and a lighting device (DC device 102) connected to a hook ceiling 132 arranged in advance on the ceiling. An illumination system K105 is provided. At the time of interior construction of the house H, the contractor attaches the lighting fixture to the hook ceiling 132, or the householder himself attaches the lighting fixture.

  In addition to using an infrared remote control device, a control instruction for the lighting apparatus that is the DC device 102 constituting the lighting system K102 can be given using a communication signal from the switch 141 connected to the DC supply line Wdc. That is, the switch 141 has a communication function together with the DC device 102. In addition, a control instruction may be given by a communication signal from another DC device 102 in the home network or the home server 116 regardless of the operation of the switch 141. The instructions to the lighting fixture include lighting, extinguishing, dimming, and blinking lighting.

  Since any DC device 102 can be connected to the DC outlet 131 and the hooking ceiling 132 described above and DC power is output to the connected DC device 102, the DC outlet 131 and the hooking ceiling 132 are distinguished below. When it is not necessary, it is called “DC outlet”.

  These DC outlets have a plug-in connection port into which a contact (not shown) provided directly on the DC device 102 or a contact (not shown) provided via a connection line is inserted into the body. The contact receiver that directly contacts the contact inserted into the connection port is held by the container. That is, the direct current outlet supplies power in a contact manner. When the DC device 102 connected to the DC outlet has a communication function, a communication signal can be transmitted through the DC supply line Wdc. A communication function is provided not only in the DC device 102 but also in the DC outlet.

  The home server 116 not only is connected to the home network, but also has a connection port connected to the wide area network NT that constructs the Internet. When the in-home server 116 is connected to the wide area network NT, it is possible to receive services from the center server 200 that is a computer server connected to the wide area network NT.

  The service provided by the center server 200 includes a service that enables monitoring and control of equipment (including mainly the DC equipment 102 but also other equipment having a communication function) connected to the home network through the wide area network NT. is there. This service makes it possible to monitor and control devices connected to the home network using a communication terminal (not shown) having a browser function such as a personal computer, Internet TV, or mobile phone.

  The in-home server 116 has both functions of communication with the center server 200 connected to the wide area network NT and communication with equipment connected to the home network, and identification information on equipment in the home network ( Here, it is assumed that an IP address is used).

  The home server 116 enables monitoring and control of home devices through the center server 200 from a communication terminal connected to the wide area network NT by using a communication function with the center server 200. The center server 200 mediates between home devices and communication terminals on the wide area network NT.

  When monitoring and controlling home devices from a communication terminal, monitoring and control requests are stored in the center server 200, and the home device periodically performs one-way polling communication to monitor from the communication terminal. And receive control requests. With this operation, it is possible to monitor and control devices in the house from the communication terminal.

  Further, when an event that should be notified to the communication terminal, such as a fire detection, occurs in the home device, the home device notifies the center server 200, and the center server 200 notifies the communication terminal by e-mail.

  An important function among the communication functions with the home network in the home server 116 is the detection and management of devices constituting the home network. The home server 116 automatically detects devices connected to the home network by applying UPnP (Universal Plug and Play). The home server 116 includes a display device 117 having a browser function, and displays a list of detected devices on the display device 117. The display device 117 has a configuration with a touch panel type or an operation unit, and can perform an operation of selecting desired contents from options displayed on the screen of the display device 117. Therefore, the user (contractor or householder) of the home server 116 can monitor or control the device on the screen of the display device 117. The display device 117 may be provided separately from the home server 116.

  The in-home server 116 manages information related to device connection, and grasps the type, function, and address of the device connected to the home network. Accordingly, the devices in the home network can be operated in conjunction with each other. Information on the connection of the device is automatically detected as described above. In order to operate the device in an interlocking manner, the device itself is automatically associated with the attribute held by the device itself, and the home server 116 is configured as a personal computer. It is also possible to connect various information terminals and use the browser function of the information terminals to associate devices.

  Each device holds the relationship of the interlocking operation of the devices. Therefore, the device can operate in an interlocked manner without passing through the home server 116. By associating the linked operations for each device, for example, by operating a switch that is a device, it is possible to turn on or off the lighting fixture that is the device. In many cases, the association of the interlocking operations is performed within the subsystem, but the association beyond the subsystem is also possible.

  By the way, the DC power supply unit 101 basically generates DC power by power conversion of an AC power supply AC supplied from outside the house like a commercial power supply. In the configuration shown in the figure, the AC power source AC is input to the power conversion device 112 through the main breaker 111 attached to the distribution board 110 as an internal unit. The power conversion device 112 includes a plurality of power supply devices 10 (three in the embodiment) described later. Each power supply device 10 (see FIG. 1) includes an AC / DC converter including a switching power supply. Since the power conversion device 112 includes a plurality of power supply devices 10, it is desirable to change the current supplied from the power supply device 10 according to the size of the load or increase or decrease the number of power supply devices 10 to be operated. The DC power output from the power converter 112 is connected to each DC breaker 114 through the cooperative control unit 113.

  The DC power supply unit 101 is provided with a secondary battery 162 in preparation for a period in which power is not supplied from the AC power supply AC (for example, a power failure period of the commercial power supply AC). It is also possible to use a solar cell 161 or a fuel cell 163 that generates DC power. The solar cell 161, the secondary battery 162, and the fuel cell 163 are distributed power sources with respect to the main power source including the power conversion device 112 that generates DC power from the AC power source AC. In the illustrated example, the solar cell 161, the secondary battery 162, and the fuel cell 163 include a circuit unit that controls the output voltage, and the secondary battery 162 includes a circuit unit that controls charging as well as discharging.

  Of the distributed power sources, the solar cell 161 and the fuel cell 163 are not necessarily provided, but the secondary battery 162 is preferably provided. The secondary battery 162 is charged in a timely manner by a main power source or other distributed power source, and the secondary battery 162 is discharged not only in a period in which power is not supplied from the AC power source AC but also in a timely manner as necessary. The cooperation control unit 113 performs charge / discharge of the secondary battery 162 and cooperation between the main power source and the distributed power source. That is, the cooperative control unit 113 functions as a DC power control unit that controls the distribution of power from the main power supply and the distributed power supply constituting the DC power supply unit 101 to the DC devices 102. Note that a configuration may be adopted in which the outputs of the solar cell 161, the secondary battery 162, and the fuel cell 163 are converted into AC power and used as input power of the power conversion device 112.

  Since the driving voltage of the DC device 102 is selected from a plurality of types of voltages depending on the device, the cooperative control unit 113 is provided with a DC / DC converter to convert the DC voltage obtained from the main power source and the distributed power source into the necessary voltage. Is desirable. Normally, one type of voltage is supplied to one subsystem (or DC device 102 connected to one DC breaker 114), but three or more wires are used for one subsystem. A plurality of types of voltages may be supplied. Alternatively, it is possible to adopt a configuration in which the DC supply line Wdc is of a two-wire type and the voltage applied between the lines is changed with time. The DC / DC converter may be provided in a plurality of dispersed manners like the DC breaker.

  The power conversion device 112, the cooperative control unit 113, the DC breaker 114, the solar cell 161, the secondary battery 162, and the fuel cell 163 described above are provided with a communication function, and include a load including the main power source, the distributed power source, and the DC device 102. It is possible to perform a cooperative operation to deal with this state. The communication signal used for this communication is transmitted in the form of being superimposed on the DC voltage in the same manner as the communication signal used for the DC device 2.

  In the above example, the power converter 112 is arranged in the distribution board 110 in order to convert the AC power output from the main breaker 111 into DC power by the power converter 112, but the output side of the main breaker 111 The branch circuit breaker (not shown) provided in the distribution board 110 branches the AC supply line into a plurality of systems, and an AC / DC converter is provided in each system for supplying AC power to each system. May be adopted.

  In this case, since the DC power supply unit 101 can be provided for each floor or room of the house H, the DC power supply unit 101 can be managed for each system, and the DC device 102 that uses DC power and Since the distance of the DC supply line Wdc between the two is reduced, the power loss due to the voltage drop in the DC supply line Wdc can be reduced. In addition, main trunk breaker 111 and branch breaker may be housed in distribution board 110, and power converter 112, cooperative control unit 113, DC breaker 114, and home server 116 may be housed in a separate board from distribution board 110. Good.

(Embodiment 1)
Below, the principal part of this embodiment is demonstrated with reference to FIG. In FIG. 1, a solid line indicates a power supply path, and a broken line indicates a communication path. As described above, the communication signal is superimposed on the DC voltage, but a communication path for transmitting the communication signal may be provided separately from the DC supply line Wdc. The DC power supply unit 101 includes a plurality of power supply apparatuses 10a to 10c (three in the illustrated example) that are operated in parallel, and each of the power supply apparatuses 10a to 10c is provided with an AC / DC converter. In the configuration example shown in FIG. 3, DC power is supplied from one DC power supply unit 101 to a plurality of systems of DC supply lines Wdc. However, in the embodiment described below, It is assumed that an appropriate number of units are arranged at appropriate locations on the DC supply lines Wdc of each system.

  As shown in FIG. 1, the power supply devices 10a to 10c (the power supply devices 10a to 10c have the same configuration, and are hereinafter referred to as the power supply device 10 unless there is a need for distinction) are an AC / DC converter or a DC / DC converter. The power supply circuit unit 11 includes a DC converter and can adjust a DC output voltage. The output voltage of the power supply circuit unit 11 is applied between the DC supply lines Wdc, thereby supplying power to the DC device 102 as a load. The In this embodiment, since the communication signal is superimposed on the DC voltage and the DC supply line Wdc is used for transmission of the communication signal, the power supply circuit unit 11 is set to have a high input impedance for the communication signal. Specifically, an inductor is inserted or a low-pass filter is inserted into a connection site between the power supply circuit unit 11 and the DC supply line Wdc.

  A plurality of power supply devices 10 are connected in parallel to the DC supply line Wdc, and the power supply devices 10 are operated simultaneously. That is, the three power supply devices 10 perform parallel operation. When a plurality of power supply devices 10 perform parallel operation, the output currents of the power supply devices 10 become unbalanced due to variations in operation of the power supply devices 10 or voltage drop due to the DC supply line Wdc to the DC device 102. May be.

  In the present embodiment, the power supply device 10 includes a current detection unit 12 that detects the output current of the power supply circuit unit 11, a voltage detection unit 13 that detects the output voltage of the power supply circuit unit 11, and other power supply devices 10 and DC devices. A communication function unit 14 that communicates with other devices such as 102 is provided. The current detection unit 12 detects the output current of the power supply circuit unit 11 using a current sensor SI formed of a so-called DC current transformer using a toroidal core and a Hall element.

  The power supply device 10 further includes the same DC supply line Wdc from the output current of the power supply circuit unit 11 of the other power supply device 10 and the output current of its own power supply circuit unit 11 acquired at an appropriate timing through the communication function unit 14. A current calculation unit 15 for obtaining an average value of output currents of all the power supply devices 10 connected to the power supply circuit, and a power supply circuit so that the current detected by the current detection unit 11 is equal to the average value obtained by the current calculation unit 15 An output control unit 16 that adjusts the output voltage of the unit 11 is provided. Depending on the operating state of the DC device 102, all the power supply devices 10 may not supply power. When a small number of power supply devices 10 can satisfy the current supplied to the DC device 102, some of the power supply devices 10 may be used. In this case, the current calculation unit 15 obtains an average value of output currents of only the power supply devices 10 that are supplying power.

  By the way, when the output current of the power supply circuit unit 11 is different from the average value obtained by the current calculation unit 15, the output control unit 16 outputs the output voltage of the power supply circuit unit 11 so that the output current becomes equal to the average value. Adjust. Here, the output control unit 16 adjusts the output voltage of the power supply circuit unit 11 in each power supply device 10 in cooperation with another power supply device 10 by communicating through the communication function unit 14. In other words, if the output voltage is adjusted in a plurality of power supply devices 10 at the same time, the fluctuation of the line voltage of the DC supply line Wdc increases, so by adjusting the output voltage of each power supply circuit 10 one by one Suppresses fluctuations in inter-voltage.

  The power supply circuit 10 that changes the output voltage is determined by the output control unit 16 as follows. That is, the output control unit 16 includes a current comparison unit 17 that compares the output current in the power supply device 10 with the average value calculated by the current calculation unit 15. When the determination result that the output current is different is obtained, the output current of the power supply circuit unit 11 is compared with the output current of another power supply apparatus 10 having a different average value, and it is determined whether or not the output current is minimum. In the power supply device 10 in which the output current is detected to be minimum in the current comparison unit 17, the output voltage of the power supply circuit unit 11 is adjusted by the voltage command unit 18 provided in the output control unit 16. The voltage command unit 18 increases the output voltage of the power supply circuit unit 11 over time.

  While the output voltage of the power supply circuit unit 11 is raised, the current detection unit 12 monitors the output current, and when the output current reaches an average value, the increase of the output voltage is stopped. However, since there is a limit to the voltage that the power supply circuit unit 11 can take as an output voltage, the voltage detection unit 13 monitors the output voltage of the power supply circuit unit 11 and reaches a voltage defined near the limit of the output voltage. The power supply device 10 does not change the output voltage even if the output current condition is not satisfied.

  The adjustment of the output voltage of the power supply circuit 10 is sequentially performed in the power supply device 10 whose output current is different from the average value. That is, when the output current of the power supply device 10 with the minimum output current reaches the average value, the output current of the other power supply device 10 becomes the minimum, so the output voltage of the power supply device 10 is adjusted.

  By repeating this operation, the output current of each power supply device 10 can be made equal to the average value. As a result, the output currents of the plurality of power supply devices 10 can be balanced, the burden on each power supply device 10 can be averaged, and an extreme difference in the life of the power supply devices 10 can be prevented. it can. Further, when the output current is increased for the power supply device 10 having the smallest output current, the output current is relatively decreased in the power supply device 10 having the largest output current, so the burden on the power supply device 10 that has caused the largest burden is reduced. can do.

  It should be noted that once the average value of the output current is obtained, the output voltage of all the power supply devices 10 that need to be adjusted is adjusted. Thereafter, the operation for obtaining the output current again and the output voltage of one power supply device 10 are adjusted. However, it is possible to calculate the average value of the output currents again. However, since the latter is more frequently monitored for the output current of each power supply device 10, it is easier to deal with load fluctuations, and the former is more frequently used for communication. As a result, an increase in traffic in communication can be suppressed. Therefore, which operation is selected is selected according to the purpose. Further, in the above-described configuration, since the current calculation unit 15 is provided in each power supply device 10, a system can be constructed with only the power supply device 10 without providing another device such as a management device.

  The adjustment procedure of the output voltage of the power supply circuit unit 11 in each of the power supply devices 10 described above is collectively shown in FIG. In FIG. 2, power supply devices A, B, and C correspond to power supply devices 10a to 10c, respectively. The timing for adjusting the output voltage of the power supply circuit unit 11 in the power supply device 10 is the voltage when the rate of change of the output current of the power supply circuit unit 11 sampled by the current detection unit 12 is equal to or greater than a specified value immediately after the power is turned on. This is when the rate of change of the output voltage of the power supply circuit unit 11 sampled by the detection unit 13 becomes equal to or higher than a specified value. The current calculation unit 15 of each power supply device 10 acquires the output current of the other power supply device 10 at at least one of these timings, and starts adjusting the output voltage.

  The averaging instruction (P1) shown in FIG. 2 means that it is time to adjust the output voltage of the power supply circuit unit 11, and each power supply apparatus 10 receives an instruction for averaging by communication from another power supply apparatus 10 or a management apparatus. Receive. Here, priorities are set in advance for each power supply device (distinguished as power supply devices A, B, and C in FIG. 2), and the power supply circuit units detected by the voltage detection unit 11 in descending order of priority. 11 is notified to the other power supply apparatus 10 (P2 to P4). With this operation, all the power supply devices 10 acquire information on the output current of the power supply circuit unit 11 detected by the other power supply devices 10.

  Next, an average value is calculated using the acquired output current (P5). As described above, in this example, the average value of the output current detected by each power supply apparatus 10 is used. When the average value is obtained, first, the voltage is adjusted so that the output current becomes equal to the average value in the power supply device 10 in which the output current of the power supply circuit unit 11 is minimum (S6). The power supply apparatus 10 that has finished adjusting the voltage transmits a completion notification to another power supply apparatus (S7). When the voltage adjustment is completed in one power supply device 10 and there is another power supply device 10 in which the output current of the power supply circuit unit 11 does not match the average value, the other power supply that has received the completion notification Among the devices 10, the voltage is adjusted in the power supply device 10 having the maximum output voltage of the power supply circuit unit 11 (S 8), and a completion notification is also transmitted from the power supply device 10. In the illustrated example, three power supply devices 10 are provided, but if the output current is averaged for the two power supply devices, the remaining power supply devices 10 converge to the average value. Is not controlled.

  In the above-described example, it is assumed that each power supply device 10 has the same configuration, but the same operation is performed even when the capacities of the power supply devices 10 (maximum allowable output current) are different. The output voltages of the power supply circuit units 11 can be matched.

(Embodiment 2)
In the configuration of the first embodiment, the configuration in which the power supply devices 10 communicate with each other in order to acquire the output current of each power supply device 10 is employed. However, in the present embodiment, as illustrated in FIG. A management device 30 that can communicate with the power supply device 10 is provided. The management device 30 obtains an average value of the output current, and adopts a configuration that instructs the appropriate power supply device 10 to adjust the output voltage based on the obtained average value. is doing. Therefore, the management device 30 includes a current calculation unit 31 and a current comparison unit 32. The current calculation unit 31 and the current comparison unit 32 have the same functions as the current calculation unit 15 and the current comparison unit 17 provided in the power supply device 10 of the first embodiment.

  In this example, the current value of the output current of the power supply circuit unit 11 detected by the current detection unit 12 of each power supply device 10 in the management device 30 is acquired, and the average value is calculated in the current calculation unit 31. Further, the current comparison unit 23 compares the average value obtained by the current calculation unit 31 with the current value of the output current in each power supply device 10, and the output current is the smallest among the power supply devices 10 whose output current is different from the average value. Is detected. The power supply device 10 thus detected is notified of the average value of the output current and instructed to adjust the output voltage of the power supply circuit unit 11.

  In the power supply device 10 that has received the notification, the average value of the notified output current is set as the target value of the output current of the power supply circuit unit 11, and the voltage is set so that the output current detected by the current detection unit 12 becomes equal to the target value. The output voltage of the power supply circuit unit 11 is adjusted by an instruction from the command unit 18. As described above, since the management device 30 needs to communicate with the power supply device 10, the management device 30 includes a communication function unit 33. The management device 30 can be provided as a function of the home server 116, but may be provided separately from the home server 116.

  The operation of this example will be described below with reference to FIG. In FIG. 5, power supply devices A, B, and C correspond to power supply devices 10a to 10c, respectively. The management device 30 first transmits a current information request to each of the power supply devices 10a to 10c in order to determine the reference voltage (P1). In response to this request, each of the power supply devices 10a to 10c returns the output voltage of the power supply circuit unit 11 detected by the voltage detection unit 13 as current information (P2 to P4).

  When current information is returned from each of the power supply devices 10a to 10c, the current calculation unit 31 of the management device 30 obtains an average output current value (P5). The obtained average value is first notified to the power supply device 10 (power supply device 10C in the illustrated example) whose output current of the power supply circuit unit 11 is minimum, and instructs to change the output voltage of the power supply circuit unit 11. (P6). The power supply device 10 that has received this instruction notifies the management device 30 of the completion of the voltage change after the voltage change (P7) (P8).

  Upon receiving the completion notification, when there is a power supply device 10 in which the output voltage of the power supply circuit unit 11 is not the reference voltage, the management device 30 applies a voltage to the power supply device 10 (power supply device 10A in the illustrated example) having the smallest output current. A change is instructed (P9), the voltage is changed by the power supply 10 (P10), and a completion notification is returned (P11). When there is another power supply circuit 10 in which the output current of the power supply circuit unit 11 does not match the average value, the same operation is repeated to make the output voltage of the power supply circuit unit 11 match the reference voltage for all the power supply devices 10.

  In the present embodiment, by providing the current calculation unit 31 in the management device 30, a plurality of power supply devices 10 can be managed collectively. Other configurations and operations are the same as those of the first embodiment.

1 is a block diagram illustrating a first embodiment. It is operation | movement explanatory drawing same as the above. It is a block diagram which shows the whole structure same as the above. FIG. 6 is a block diagram illustrating a second embodiment. It is operation | movement explanatory drawing same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 (10a-10c) Power supply device 11 Power supply circuit part 12 Current detection part 13 Voltage detection part 14 Communication function part 15 Current calculation part 16 Output control part 17 Current comparison part 18 Voltage command part 30 Management apparatus 31 Current comparison part 32 Voltage command Unit 33 Communication function unit 102 DC equipment Wdc DC supply line

Claims (5)

  1.   A power supply system that supplies power to a DC device driven by DC power by connecting and operating a plurality of power supply devices connected to each other via a DC supply line in parallel. A power supply circuit unit that can adjust the output voltage, a current detection unit that detects an output current of the power supply circuit unit, and a communication function unit that communicates with other devices, and further, through each communication function unit The current calculation unit that obtains the output current of the power supply device and calculates the average value of the output currents of all the power supply devices, and the power supply circuit unit so that the current detected by the current detection unit becomes the average value calculated by the current calculation unit A power supply system comprising: an output control unit that instructs an output voltage.
  2.   The output control unit is a current comparison unit that compares the output current in the power supply device with the average value calculated by the current calculation unit, and the output current is the smallest among the power supply devices in which the output current and the average value are different. The power supply system according to claim 1, further comprising: a voltage command unit that controls an output voltage of the power supply circuit unit so as to raise an output current to an average value for the power supply device.
  3.   The power supply system according to claim 1, wherein the current calculation unit is provided in each power supply device.
  4.   The power supply system according to claim 1, further comprising a management device capable of communicating with the power supply device, wherein the current calculation unit is provided in the management device.
  5.   5. A power supply device used in the power supply system according to claim 1, wherein the power supply circuit unit is configured to output DC power and adjust an output voltage, and to detect an output current of the power supply circuit unit. A current detection unit, a communication function unit that communicates with another device, a current calculation unit that obtains an output current of another power supply device through the communication function unit and calculates an average value of the output currents of all the power supply devices, and a current An output control unit for instructing the output voltage of the power supply circuit unit so that the current detected by the detection unit becomes an average value calculated by the current calculation unit, and the output control unit converts the output current in the power supply device to the current calculation unit The output voltage of the power supply circuit unit so as to raise the output current to the average value when the output current is the smallest among the power supply units in which the output current and the average value are different, and the current comparison unit that compares with the average value calculated in A voltage command section for controlling Power supply, characterized in that the.
JP2007341327A 2007-12-28 2007-12-28 Power supply system and its power supply unit Pending JP2009165247A (en)

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JP2014042454A (en) * 2012-05-25 2014-03-06 Panasonic Corp On-vehicle power supply apparatus and photovoltaic apparatus
JP2015508275A (en) * 2012-02-06 2015-03-16 アーベーベー・テクノロジー・アーゲー Converter for battery charging station
WO2016021371A1 (en) * 2014-08-05 2016-02-11 ソニー株式会社 Dc power transmission device, dc power reception device, and dc power transmission system
KR101764568B1 (en) * 2016-02-16 2017-08-10 주식회사 동아일렉콤 A power supply apparatus and system using an integrated communication module

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JPS61207136A (en) * 1985-03-11 1986-09-13 Nec Corp Parallel operation power source unit
JPH08115133A (en) * 1994-10-19 1996-05-07 Hitachi Ltd Power unit
JP2006262593A (en) * 2005-03-16 2006-09-28 Matsushita Electric Works Ltd Feed controller, feeder, and feeder system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015508275A (en) * 2012-02-06 2015-03-16 アーベーベー・テクノロジー・アーゲー Converter for battery charging station
JP2014042454A (en) * 2012-05-25 2014-03-06 Panasonic Corp On-vehicle power supply apparatus and photovoltaic apparatus
WO2016021371A1 (en) * 2014-08-05 2016-02-11 ソニー株式会社 Dc power transmission device, dc power reception device, and dc power transmission system
US10326270B2 (en) 2014-08-05 2019-06-18 Sony Corporation DC power transmission device, DC power reception device, and DC power transmission system
KR101764568B1 (en) * 2016-02-16 2017-08-10 주식회사 동아일렉콤 A power supply apparatus and system using an integrated communication module

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