JP4807836B2 - DC power distribution system and electrical apparatus used therefor - Google Patents

Description

  The present invention relates to a DC power distribution system and an electric device used therefor.

  In recent years, distributed power sources such as solar power generation, wind power generation, and fuel cell power generation have attracted attention. The electric power generated from these distributed power sources is what is called clean energy or new energy. With the support of the national system, the amount of power generated by distributed power sources will be about 1.18 million kW (kilowatts) for solar power generation in the next few years, about 23 times that for wind power generation. Is expected to increase to 1.34 million kW.

  For such generated power from the distributed power source, a system that is linked to a conventional AC power system (commercial power source) using a synchronous generator is generally employed. In other words, surplus power generated by the distributed power source is sent to the AC power system. In this way, it is possible to effectively use surplus power from the distributed power source. Therefore, if the distributed power source is, for example, by photovoltaic power generation, the DC power obtained by photovoltaic power generation is converted to AC power with the same amplitude and phase as the sine voltage waveform of the AC power system. An inverter for conversion is used. Such an inverter is connected in parallel to the AC power system and the indoor wiring, and sends the surplus power from the distributed power source to the AC power system and supplies power to the electrical equipment that works with AC connected to the indoor wiring. (For example, refer to Patent Document 1).

  In addition, electric devices that become loads, for example, home appliances used in general households, electric motors used in factories, etc., have recently been introduced with a lot of electronic control by semiconductor devices, and home appliances or Industrial equipment has a rectifier circuit, and once AC power from the AC power system is converted to DC power, it has become a mainstream technology trend, and many home appliances have already been connected to DC power distribution systems ( The power system that distributes DC voltage).

When such a distributed power supply becomes widespread, instead of a system that uses power from a conventional AC power system, a DC power distribution system, that is, DC power is supplied to indoor wiring, and this power is used as an electric device. There is still little research in this field, and attempts are being made to open up the possibility of unknown DC power distribution.
JP-A-10-31525

  As one of the possibilities of such DC distribution, a novel electric device operating in cooperation with the DC distribution system, and the flow of power between the DC distribution system and the wiring using such an electric device The inventors of the present application have come up with a DC power distribution system that can optimize the above. The present invention provides an electrical device that operates in conjunction with a DC distribution system and a DC distribution system including such an electrical device.

  In order to solve such a problem, an electrical device according to the present invention is an information transmission device that transmits information on an operating state of the electrical device via the wiring in an electrical device that operates with power from a wiring to which direct-current power is supplied. A circuit is provided, and the information transmission circuit sends an operation start information signal to the wiring before the electric device starts power consumption.

  The electrical device having such a configuration is operated by power from a wiring to which DC power is supplied, and includes an information transmission circuit that transmits information on the operation state of the electrical device through the wiring. Since the information transmission circuit sends an operation start information signal to the wiring before the electric device starts to consume power, the information signal can be detected from the wiring, and other devices connected to the wiring are easy. In addition, it is possible to know the operating state of this electric device.

  In order to solve such a problem, another electrical device of the present invention is an electrical device that operates with power from a wiring supplied with DC power, and transmits an information signal related to the operating state of the other electrical device via the wiring. Comprising an information receiving circuit for receiving, wherein the information receiving circuit detects an information signal sent by another electric device using power supplied to the wiring before the electric device starts consuming power; Whether or not to start the power consumption of the electrical device is determined according to the content of the information signal sent by the other electrical device.

  In such an electric device having another configuration, the electric device operates by power from a wiring to which DC power is supplied, and this electric device receives information signals regarding the operating state of the other electric device through the wiring. A receiving circuit is provided. The information receiving circuit detects an information signal sent from another electric device that uses the power supplied to the wiring before the electric device starts to consume power, and the information receiving circuit detects the information signal sent from the other electric device. Since it is determined whether to start the power consumption of the electric device according to the contents, an excessive current does not flow through the wiring by operating in cooperation with a plurality of electric devices connected to the wiring.

  In order to solve such a problem, another electrical device of the present invention is an electrical device that operates with power from a wiring to which direct current power is supplied, and an information signal related to the operating state of the electrical device is transmitted via the wiring. An information transmission / reception circuit for transmitting and receiving an information signal relating to an operating state of another electrical device connected to the wiring via the wiring, wherein the information transmission / reception circuit starts power consumption by the electrical device; Before, when there is an information signal for detecting the presence of an information signal sent from another electric device using power supplied to the wiring and notifying the start of operation sent from the other electric device, the electric signal When the start of power consumption of the device is stopped and there is no information signal notifying the start of operation sent by the other electric device, an information signal notifying the start of its own operation is sent and It was decided to initiate the power consumption of the electrical device.

  In the electric device having such a configuration, the electric device operates with electric power from a wiring to which DC power is supplied, and transmits information on the operating state of the electric device through the wiring and is connected to the other wiring. An information transmission / reception circuit for receiving information on the operating state of the electric device via the wiring is provided. Before the electric device starts to consume power, the information transmission / reception circuit detects the presence / absence of operation start information sent by another electric device that uses the power supplied to the wiring. If there is information on the start of operation, the start of power consumption of the electric device is stopped, and if there is no information on start of operation, the power consumption of the electric device is started. Never start. In this way, the electric power from the wiring is used in cooperation with the electrical devices.

  In order to solve this problem, a DC power distribution system according to the present invention includes a wiring to which DC power is supplied from a DC power distribution system, a connection control device that controls connection between the DC power distribution system and the wiring, and a wiring from the wiring. An electric device that operates by electric power, and an electric storage device that discharges electric power to the wiring and stores surplus electric power in the wiring, and the electric device receives an information signal regarding an operating state of the electric device, An information transmission circuit for transmitting via the wiring, wherein the connection control device includes an information receiving circuit for receiving an information signal relating to an operating state of the electrical device via the wiring; The connection between the DC distribution system and the wiring is controlled in accordance with an information signal relating to the operating state of the electrical device.

  In the DC power distribution system having such a configuration, a wiring to which DC power is supplied from the DC power distribution system, a connection control device that controls connection between the DC power distribution system and the wiring, and an electric device that operates by the power from the wiring; And a power storage device that discharges power to the wiring and stores surplus power in the wiring, so that power can be exchanged between the electrical devices and between the capacitors and from the DC power distribution system. DC power can be supplied. Further, the electrical device includes an information transmission circuit that transmits an information signal related to the operating state of the electrical device via a wiring, and the connection control device transmits an information signal related to the operating state of the electrical device via the wiring. Since the information receiving circuit for receiving is provided, the connection device can know the operating state of the electric device. And since a connection control apparatus controls the connection of a DC distribution system and the said wiring according to the information signal regarding the operating state of an electric apparatus, the flow of the electric power in a DC distribution system and a wiring can be optimized.

  ADVANTAGE OF THE INVENTION According to this invention, the direct current distribution system containing such an electrical apparatus and an electrical apparatus which operate | moves in cooperation with a direct current distribution system can be provided.

  A DC power distribution system 10 that is an example of a DC power distribution system will be described with reference to FIG. The DC distribution system of FIG. 1 has a wiring 20 composed of a + side wiring 20 a and a − side wiring 20 b to which DC power is supplied from the DC distribution system 11, and connection control for controlling connection between the DC distribution system 11 and the wiring 20. A device 60; an electric device 30, an electric device 40, and an electric device 50 that operate with electric power from the wiring 20; and a power storage device 70 that discharges electric power to the wiring 20 and stores surplus electric power in the wiring. ing.

The electrical device 30 includes an information transmission circuit 32 that transmits information related to the operating state of the electrical device 30 via the wiring 20, and the electrical device 40 is each of the electrical device 30 or the electrical device 50 that is another electrical device. The information receiving circuit 42 that receives information related to the operation state of the electric device 50 is provided via the wiring 20, and the electric device 50 transmits information related to the operation state of the electric device 50 via the wiring 20 and other electric devices. The information transmission / reception circuit 52 which receives the information regarding the operation state of each of the electric device 30 or the electric device 40 which is the information via the wiring 20 is provided.
In addition, the connection control device 60 and the power storage device 70 include an information receiving circuit 42 that receives information related to the operation states of the electric device 30 and the electric device 50 via the wiring 20. In the DC power distribution system 10, the units operate in cooperation with each other according to the communication functions of the information transmission circuit 32, the information reception circuit 42, or the information transmission / reception circuit 52, and can perform various functions described below.

  The electric device 30 will be described in more detail. The electric device 30 is an electric device that operates with electric power from the wiring 20 to which DC power is supplied. The electrical device 30 gives information related to the operating state of the electrical device 30 to the information transmitting circuit 32 that transmits the information via the wiring 20, the power unit 33 that consumes DC power, and the information transmitting circuit 32. , And a filter 12 that applies DC power to the power unit 33.

  A configuration example of the filter 12 is shown in FIG. The filter 12 is a so-called band division filter. The terminal A and the terminal B are connected to the + side wiring 20 a and the −side wiring 20 b, and the terminal C and the terminal D are connected to the power unit 33. Then, each of the terminal E and the terminal F is connected to the information transmission circuit 32. Only the DC voltage input from the terminals A and B is supplied to the power unit 33 by the low-pass filter including the inductor L1, the inductor L2, and the capacitor C1 provided in the filter 12, and the information signal in the wiring 20 This prevents the level from falling. The high-pass filter configured by the capacitor C2 and the capacitor C3 provided in the filter 12 prevents the DC voltage from the wiring 20 from being supplied to the information transmission circuit 32, and the information signal from the information transmission circuit 32 is The electric device 40, the electric device 50, the connection control device 60, and the power storage device 70, which are other electric devices, can be supplied via the wiring 20.

  A configuration example of the information transmission circuit 32 is shown in FIG. The information transmission circuit 32 includes an oscillator 321 and a modulator 322. The oscillator 321 generates a reference clock serving as a reference, and is composed of, for example, a crystal oscillator. Further, the modulator 322 sends a modulation signal based on the reference clock from the oscillator 321 and the transmission information from the power unit input from the terminal I to the terminal G and the terminal H.

  The information transmission circuit 32 configured as described above does not have a function of receiving an information signal from the electric device 50 which is another electric device. The reason is that the electrical device 30 has a high priority of energization and should be energized whenever necessary regardless of whether the electrical device 40 or the electrical device 50 which is another electrical device is energized. This is because. For example, the electric device 30 is a television receiver in which a conventional television receiver is arranged in the power unit 33. When the user feels necessary, the electric device 30 can be switched on at any time. .

  FIG. 4 shows a format of an information signal which is a transmission output sent from the information transmission circuit 32, and has a VFO part, an ID part, a DATA1 part and a DATA2 part. The VFO unit is a portion that is inserted in order to generate a clock that is required when another electrical device demodulates an information signal and receives each information included in the ID unit, DATA1 unit, and DATA2 unit. Thus, the signal is a repetitive signal having a constant period that repeats in a minimum inversion period to be described later.

  The ID part is a part that is assigned to each electric device and corresponds to an ID (identification information) for specifying the electric device 30. The DATA1 part is a part including an information signal indicating what operation state the electric device 30 is in. The information signal is transmitted from the terminal J of the power unit 33 to the terminal I. The content of this information signal is, for example, how many Sec (seconds) after which power is supplied to the power unit 33 of the electrical device 30, how much A (ampere) of current flows as inrush current (inrush current), and how It is information on whether the steady state is reached after a long time. The DATA2 part is a part that describes the priority order when the operation competes with other electrical devices. For example, the order from 1 to 10 is included in the DATA2 part, and the smaller number has priority. The ranking is high. The information signal corresponding to the ID part, DATA1 part and DATA2 part is formed as a signal encoded by a so-called RLL (Run Length Limited Code), for example, and has a limitation on the minimum inversion period and the maximum inversion period. For example, the encoded signal is a 1-7 code, a 2-7 code, or the like.

The electric device 40 will be described in more detail. The same parts as those in the electric device 30 are denoted by the same reference numerals and description thereof is omitted. The electric device 40 is an electric device that operates with electric power from the wiring 20 to which DC power is supplied. The electric device 40 includes an information receiving circuit 42 that receives information on the operation state of the electric device 30 or the electric device 50, which is another electric device, via the wiring 20, a power unit 43 that consumes DC power, and information reception The circuit 42 is provided with information relating to the operating state of the electric device 40 or 50 and the filter 12 for applying DC power to the power unit 43.

  In the filter 12, as in the electrical device 30, the terminal A and the terminal B are connected to the + side wiring 20 a and the −side wiring 20 b, and the terminal C and the terminal D are connected to the power unit 43. Thus, each of the terminal E and the terminal F is connected to the information receiving circuit 42. Only the DC voltage input from the terminals A and B is supplied to the power unit 43 by the low-pass filter including the inductor L1, the inductor L2, and the capacitor C1 provided in the filter 12, and the capacitor C2 provided in the filter 12 And a high-pass filter including the capacitor C3 prevents the DC voltage from the wiring 20 from being supplied to the information receiving circuit 42, and the electrical device 30 and the electrical device, which are other electrical devices, via the wiring 20 Information transmitted from 50 can be supplied to the information receiving circuit 42.

A configuration example of the information receiving circuit 42 is shown in FIG. The information receiving circuit 42 does not have a function of transmitting information to the electric device 50 that is another electric device. The reason is that the electric device 40, in response to energization of the electrical device 30 or the electrical device 50 is a priority higher have other electrical apparatus energized, because an electrical device that energization is limited.

  As shown in FIG. 5, the information receiving circuit 42 includes a PLL circuit (phase locked loop) 421 and a demodulator 422. The PLL circuit 421 generates a reference clock serving as a reference from the RLL signal, and includes, for example, a VCO (Voltage Controlled Oscillator), a PC (Phase Comparator), and a characteristic compensation filter circuit. . Further, the demodulator 422 demodulates an information signal input from the terminal K and the terminal L from another electric device using a reference clock from the PLL circuit 421, and sends the demodulated information signal to the terminal M.

  The information signal transmitted from the terminal M and taken into the power unit 43 through the terminal N includes the ID signal from the ID unit, the DATA1 signal from the DATA1 unit, and the DATA2 signal from the DATA2 unit. Detects the priority indicated by the DATA2 signal and determines how to process the power consumption in the power unit 43. That is, before the electric device 40 starts to consume power, an information signal sent by another electric device using the power supplied to the wiring 20 is detected, and the information signal sent according to the content of the other electric device is detected. Thus, it is determined whether or not to start power consumption of the electric device 40.

  For example, when the electrical device that is sending information to the wiring 20 has a higher priority than itself, the power supply is supplied to the power unit 33 of the electrical device 30 after a predetermined time specified by the DATA1 signal. During the time until the steady state is reached, the supply of power to the power unit 43 of itself (electrical device 40) is stopped. Alternatively, when it is determined that the amount of the inrush current in the wiring 20 overlaps with the start of energization of another electrical device, power is supplied to the power unit 43 of the electrical device 40. The determination of how to turn on the power or whether to wait without turning on the power is made by an MPU (micro processing unit) (not shown) disposed in the demodulator 422.

  In addition, the information receiving circuit 42 detects the presence of an information signal sent from another electric device, or if the wiring 20 is in a state where there is no problem even if the electric device 42 is turned on. Can start supplying power to the power unit 43 of the electric device 42.

  In addition, the DATA1 signal sent out by another electrical device is not limited to designating the time from the inrush current until it settles to a steady state, but the inrush current is simply flowing in another electrical device, for example, the electrical device 30. May be used as a signal for displaying. In this case, the information receiving circuit 42 of the electric device 40 detects that such information is present, and before the electric device 40 starts to consume power again without supplying power to the power unit 43. The detection of the presence / absence of information transmitted by another electrical device may be repeated. In this way, the electrical device 40 can wait for the power to be supplied to the power unit 43 until the inrush current of the electrical device 30 is settled.

  In this way, the inrush current of the electric device 42 and the excessive current of other electric devices do not overlap each other, so that an excessive current flows through the wiring 20 to prevent a sudden drop in voltage, and consequently the DC distribution system 11. Can be prevented from overloading.

  The electric device 50 will be described in more detail. The same parts as those in the electric device 30 and the electric device 40 are denoted by the same reference numerals, and description thereof is omitted. The electric device 50 is an electric device that operates with electric power from the wiring 20 to which DC power is supplied. The electric device 50 includes the information transmission / reception circuit 52 that receives information about the operation state of the electric device 40 that is another electric device via the wiring 20, the power unit 53 that consumes DC power, and the information transmission / reception circuit 52. And a filter 12 that provides information on the operating state of the electrical device 30 that is an example of the electrical device, and applies DC power to the power unit 53.

  In the filter 12, as in the electrical device 30, the terminal A and the terminal B are connected to the + side wiring 20 a and the −side wiring 20 b, and the terminal C and the terminal D are connected to the power unit 43. Thus, each of the terminal E and the terminal F is connected to the information transmission / reception circuit 52. Only the DC voltage input from the terminal A and the terminal B is supplied to the power unit 53 by the low-pass filter including the inductor L1, the inductor L2, and the capacitor C1 provided in the filter 12, and the capacitor C2 provided in the filter 12 And a high-pass filter composed of the capacitor C3 prevents the DC voltage from the wiring 20 from being supplied to the information transmission / reception circuit 52, and is transmitted from the electrical device 30 which is another electrical device via the wiring 20. Information can be supplied to the information transmission / reception circuit 52, and information from the information transmission / reception circuit 52 can be transmitted to the electrical device 40, which is another electrical device.

  The power unit 53 consumes a large amount of inrush power from the wiring when the power is turned on and when the mode is switched, such as a refrigerator, a washing machine, an air conditioner, and an indoor elevator, or regenerative power such as a washing machine and an indoor elevator. This corresponds to an electrical device that supplies the wire 20 to the wiring 20. In such a device, the self knows the power situation in the wiring 20 before the operation starts, and greatly affects other electric devices. Therefore, before starting the operation, the other electric devices, the connection control device 60 and By notifying the power storage device 70 to that effect, it is possible to optimize the power supply in the wiring 20, prevent a sudden drop and increase in voltage, and, in turn, prevent the DC distribution system 11 from being overburdened.

  A configuration example of the information transmitting / receiving circuit 52 is shown in FIG. The information transmission / reception circuit 52 includes an information reception circuit 42 and an information transmission circuit 32. The terminals O and P function as bidirectional information transmission terminals, function as input terminals when the information reception circuit 42 operates, and function as output terminals when the information transmission circuit 32 operates. The terminal Q is a terminal for interfacing with the power unit 53, and transmits information of another electrical device via the terminal R by the information signal demodulated by the information receiving circuit 42, and self (power unit 53). Information signals relating to the operation of the device are transmitted to other electrical devices.

  As shown in FIG. 6, since the electric device 50 including the information transmitting / receiving circuit 52 includes the information receiving circuit 42 and the information transmitting circuit 32, the priority order is determined in cooperation with other electric devices. Thus, the timing of energizing the power unit 53 can be determined.

  Here, the priority order will be described. As described above, the electric device having only the information transmission circuit 32 has the highest priority, and when a plurality of electric devices having only the information transmission circuit 32 compete, power is supplied to both of the power units. When a plurality of electric devices having the information transmission / reception circuit 52 compete with each other, it is first determined whether or not there is information on the wiring 20 before sending the transmission information. If there is information, in principle, However, depending on the contents of the DATA1 signal and the DATA2 signal, the operation of the electrical device that outputs the information can be stopped and the current supply can be prioritized. .

  Here, the properties of information signals handled by the information transmission circuit 32, the information reception circuit 42, and the information transmission / reception circuit 52 will be described. Similarly, in the conventional AC power distribution system, a method of superimposing an information signal on the wiring has been adopted. However, since the power supplied to the wiring is 50 Hz or 60 Hz AC, the filter 12 separates both of them. However, the separation is difficult, and the output of the momentum information signal has to be large. For this reason, it is not included in the range of weak radio waves defined by the Radio Law, and in particular, the information signal has a frequency range of 10 kHz to 450 kHz.

  However, in the present embodiment, the power supplied to the wiring 20 is DC, while the information signal is an AC signal encoded as an RLL signal. The filter 12 can be separated, and the output level of the information signal can be reduced. Furthermore, by reducing the output level of the information signal, the frequency band can also be increased to 450 kHz or higher, enabling higher-speed and higher-density communication (which means a larger amount of data per unit time). It will be. If a wiring having good frequency characteristics is used as the wiring 20, it is possible to transmit and receive a video signal as an information signal, and it can be used for a wider range of control and a wider range of applications.

  Next, the connection control device 60 will be described. The connection control device 60 is an example of a device that connects or disconnects the DC power distribution system 11 and the wiring 20. The connection control device follows a breaker that is disconnected by detecting an overcurrent that has been used in an AC power supply in the past, and the overcurrent detection direction is bidirectional, and an overcurrent flows from the DC distribution system 11 to the wiring 20. In addition, when an overcurrent due to regenerative power from the electric device flows through the wiring 20 or when an overcurrent flows from the power storage device 70, the circuit breaker may be a dedicated DC breaker that disconnects the connection between the DC distribution system 11 and the wiring 20. Although it is good, in this embodiment, it was configured as a connection control device having a communication function with the electric device.

  In the following description of the connection control device 60, the same parts as those in the electric device 30, the electric device 40, and the electric device 50 are denoted by the same reference numerals, and the description thereof is omitted. A connection control device 60 shown in FIG. 1 includes a filter 12, an information receiving circuit 42, a connection control circuit 61, a switch 65, and a current detector 64. The disconnection of the switch 65 is controlled by a disconnection signal from the terminal T of the connection control circuit 61. The connection control circuit 61 inputs an information signal from the terminal M of the information receiving circuit 42 from the terminal V, and inputs a current from the current detector 64 from the terminal S to generate a disconnection signal. The filter 12 separates the wiring 20 and the DC distribution system 11 in a high frequency manner, and prevents an information signal supplied to the wiring 20 from flowing out to the DC distribution system. This prevents information signals from leaking outside the same wiring, and prevents information signals from leaking to wiring (not shown) in another house or factory connected to the DC power distribution system 11.

  As described above, the DC power distribution system 10 of this embodiment includes the wiring 20 to which DC power is supplied from the DC power distribution system, the connection control device 60 that controls the connection between the DC power distribution system 11 and the wiring 20, and the wiring 20. And an electric storage device 70 that discharges electric power to the wiring 20 and stores surplus electric power in the wiring. The electric device includes an information transmission circuit that transmits an information signal related to the operating state of the electric device via the wiring 20, and the connection control device 60 transmits an information signal related to the operating state of the electric device via the wiring 20. And an information receiving circuit for receiving. For this purpose, the connection control device 60 controls the connection between the DC power distribution system 11 and the wiring 20 in accordance with the information signal related to the operating state of the electrical device, thereby achieving proper power supply in the DC power distribution system 10. it can.

  As an example of the control for optimizing the power supply performed by the connection control circuit 61, the current detector 64 detects the value of the current flowing from the DC distribution system 11 to the wiring 20 or the current flowing from the wiring 20 to the DC distribution system 11. When the current value exceeds a predetermined value, the disconnect signal from the terminal T disconnects the switch 65. In this case, if an abnormality occurs in the DC power distribution system 11 and a predetermined voltage cannot be obtained in the DC power distribution system 11, the wiring 20 is disconnected from the DC power distribution system 11 and stable from the power storage device 70. The direct current power can be supplied to the wiring 20. In this case, when the content of the abnormality is a voltage drop in the DC power distribution system 11, it is possible to prevent DC power from flowing out from the power storage device 70 to the DC power distribution system 11.

  As another example of the control performed by the connection control circuit 61, the information receiving circuit 42 of the connection control circuit 61 is notified by an information signal that regenerative power of a predetermined amount or more is supplied from the electrical device 30 or 50. In this case, the disconnection signal from the terminal T disconnects the switch 65 to prevent a voltage increase in the DC distribution system 11 and to prevent other electric devices connected to the DC distribution system 11 from being damaged. The excess power can be absorbed by the power storage device 70 connected to the power supply 20.

  Here, when the electric power unit 33 or the electric power unit 53 in the electric device 30 or the electric device 50 is a device having a regeneration function such as an electric motor, a rectifier diode is not included on the input side of the electric power unit 33 or the electric power unit 53. It is made like that. The reason is that these devices operating in the conventional AC distribution system usually include a rectifier circuit (rectifier diode) on the input side. In this case, the regenerative power cannot be returned to the wiring 20. Therefore, in the AC distribution system, this power is consumed by resistance. On the other hand, in the DC power distribution system according to the present embodiment, the operation of the device can be ensured without including the rectifier diode, so that the regenerative power generated in the device is blocked by the rectifier diode in such a manner that the rectifier diode is not included. Thus, the power can be supplied to the wiring 20 without being regenerated, and the advantage that the regenerative power can be reused can be enjoyed.

  Next, the power storage device 70 will be described. In the following description, the same parts as those of the electric device 30, the electric device 40, and the electric device 50 are denoted by the same reference numerals, and description thereof is omitted. The power storage device 70 is a device that is connected to the wiring 20 and supplies power to the electrical device, and stores a surplus of regenerative power from the electrical device. In order to achieve this object, the power storage device includes a battery 73, an information receiving circuit 42, a power storage control circuit 71, a current detector 74, a switch 75, and a filter 12 that always maintain a substantially constant voltage regardless of the amount of power stored. It is supposed to be.

  The storage device 73 is a storage device that can be charged and discharged while maintaining a substantially constant voltage regardless of the load current, and is, for example, a lead storage battery or a lithium ion battery. The current detector 74 detects the discharge current and the charge current from the battery 73 and inputs them to the terminal X of the power storage control circuit 71. The information receiving circuit 42 receives and demodulates an information signal from the electric device 30 or the electric device 50 which is another electric device, and this demodulated information signal is sent to the power storage control circuit 71 via the terminal M. The signal is input to the terminal U. The switch 75 that disconnects the connection between the wiring 20 and the battery 73 is controlled by a signal from the terminal W of the battery control circuit 71.

  As an example of control in the power storage device 70, the switch 75 is disconnected by a signal from the terminal W of the power storage control circuit 71 when the value of the discharge current or the charge current is a predetermined value or more. That is, the current detector 74 detects the discharge current and the charge current from the capacitor 73 and inputs them to the terminal X of the power storage control circuit 71. If the value of the discharge current or the charge current is equal to or greater than a predetermined value, the current detector 74 The switch 75 is disconnected by a signal from the terminal W of the control circuit 71 to prevent the capacitor 73 from being damaged.

  As another example of the control in the power storage device 70, when the information receiving circuit 42 receives an information signal indicating that regenerative power is sent from the electrical device 30 or 50, for example, the switch is assumed to be sufficiently charged. Even when the connection of 75 is disconnected, the switch 73 is connected and the capacitor 73 absorbs the charging current. Here, the power storage device 70 includes the information receiving circuit 42. However, the information transmitting circuit 32 or the information transmitting / receiving circuit 52 is provided instead of the information receiving circuit 42, and an information signal related to the stored power of the power storage 73 is supplied to the electric device. 40 or the electric device 50 may be used. Furthermore, the power storage device 70 may include a breaker that detects and disconnects a bidirectional overcurrent instead of the switch 75.

  According to the electric device of the present embodiment described above, an electric device that operates in cooperation with a DC distribution system can be provided. Here, the content of the operation linkage is, for example, that the operation start of each electric device is shifted so that the inrush currents do not overlap and the electric power from the DC distribution system is made uniform. That are used in common between each other, or that store electricity in a capacitor, or that start power supply at the same time as other electrical devices, etc. There are various cases. In order to enable such an operation, each of the electrical devices is provided with an information transmission circuit, an information reception circuit, or an information transmission / reception circuit to communicate with each other. Here, since the power supplied to the wiring is DC, the signal level (signal magnitude) of the information signal is sufficient S / N (signal pair) even if the level of the information signal supplied to the wiring is low. Noise ratio). In addition, since the power supplied to the wiring is DC, no rectifier diode is required on the input side of the power unit of each electric device, so that regenerative power generated in each power unit can be easily supplied to the wiring. It will be a thing.

  Further, according to the above-described DC power distribution system of the present embodiment, each of the electric devices that receive power supply from the wiring includes an information transmission circuit, an information reception circuit, or an information transmission / reception circuit, Since the connection control device having at least the information receiving circuit is provided, the connection control device determines that the exchange of power between the DC distribution system and the wiring is appropriate based on the operation information from each electric device, and supplies the power to the DC distribution system. The burden can be reduced. Furthermore, when the power storage device includes the information receiving circuit, charging and discharging in the power storage device can be more appropriately controlled.

It is a lineblock diagram of a direct-current power distribution system of an embodiment. It is a block diagram of the filter of embodiment. It is a block diagram of the information transmission circuit of embodiment. It is the format of the information signal of embodiment. It is a block diagram of the information receiving circuit of embodiment. It is a block diagram of the information transmission / reception circuit of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 DC power distribution system, 11 DC power distribution system, 11 DC power distribution system, 12 Filter, 20 Wiring, 30, 40, 50 Electrical apparatus, 32 Information transmission circuit, 33, 43, 53 Power part, 42 Information reception circuit, 52 Information transmission / reception Circuit, 60 connection control device, 61 connection control circuit, 64, 74 current detector, 65, 75 switch, 70 power storage device, 71 power storage control circuit, 73 power storage device, 321 oscillator, 322 modulator, 421 PLL circuit, 422 demodulator , A to X terminals, C1, C2, C3 capacitors, L1, L2 inductors

Claims (10)

DC power is connected to a wiring to be supplied, operated by electric power from the wiring, a one electrical device in the priority of the power supply a plurality of different electrical devices,
Through the wiring, comprising a information reception circuit priority than itself receives the information signals relating to the operation state of the other electric devices of the upper,
Before the electric device starts consuming power, the information receiving circuit detects an information signal sent by another electric device having a higher priority than itself , and the contents of the information signal sent by the other electric device In accordance with the electric device, the electric device determines whether to start the electric power consumption of the electric device itself . When the information receiving circuit detects that there is an information signal sent by the other electric device, the information signal sent by the other electric device again before the electric device starts consuming power. The electric device according to claim 1 , wherein the detection of the presence or absence of is repeated. DC power is connected to a wiring to be supplied, operated by electric power from the wiring, a one electrical device in the priority of the power supply a plurality of different electrical devices,
Through the wiring for priority than itself subordinate other electrical device, transmits an information signal regarding its operating status, priority than itself an information signal relating to the operation state of the other electrical device Top An information transmitting / receiving circuit for receiving is provided,
Before the electric device starts consuming power, the information transmitting / receiving circuit detects an information signal transmitted by another electric device having a higher priority than itself, and the other electric device having a higher priority than the self Determines whether or not to start power consumption of the electrical device according to the content of the information signal transmitted by the device, and consumes power from the wiring in cooperation with other electrical devices of lower priority than the electrical device. An electrical device characterized by: Before the electric device starts to consume power, the information transmission / reception circuit detects the presence / absence of an information signal transmitted by another electric device having a higher priority than itself and If there is an information signal notifying the start of operation sent out by the electric device, the information signal notifying start of power consumption of the electric device and notifying the start of operation sent by another electric device with higher priority than the self If there is no, according to claim 3, characterized in that the information signal indicating its own operation start priority than self sends out to other electrical devices in the lower, it initiates the power consumption of the electrical device Electrical equipment. In a DC power distribution system formed by connecting a plurality of electric devices having different power supply priorities to a wiring to which power from a DC power distribution system is supplied,
An information receiving circuit for receiving an information signal related to an operating state of another electric device having a higher priority than the self through the wiring; and a power unit for controlling the use of its own power by determining the information receiving circuit. One type of electrical device;
Via the wiring, to the other electrical device having a lower priority than the self, an information signal related to the operation state of the device is transmitted, and to the other electrical device having a higher priority than the self, an information signal related to the operation state of the other electrical device having a higher priority than the self A second type of electric device comprising an information transmitting / receiving circuit and a power unit that controls the use of its own power by determining the information transmitting / receiving circuit;
A third type of electric device comprising an information transmitting device for transmitting an information signal relating to its own operating state to another electric device having a lower priority than itself via the wiring;
Among them, when a plurality of electrical devices having different power supply priorities are connected to the wiring,
The electrical device with the lower priority order determines whether to start the power consumption of the electrical device with the lower priority order according to the content of the information signal transmitted by the other electrical device with the higher priority order than itself. DC power distribution system characterized by determining. A plurality of the second type electric devices are connected to the wiring, and the information transmission / reception circuit of the second type electric device competes with other electric devices of the second type for use of power. If we detect that
The power unit of the second type electric device controls whether or not to use its own electric power based on an information signal related to an operating state transmitted from another electric device of the second type. The DC power distribution system according to claim 5. A plurality of electric devices including the third type electric device are connected to the wiring, and the first type electric device, the second type electric device, or the third type other electric device is connected. If there is a power usage conflict with the device,
The power unit of the third type electric device starts to use power as needed, and the information transmission circuit of the third type electric device transmits the operation state of its own electric device via the wiring. The DC power distribution system according to claim 5, wherein: Which is connected to the wiring, thereby releasing the power for the wire, further comprising a power storage device storing electric surplus power in the wiring,
The power storage device includes an information receiving circuit, a power storage control circuit, and a battery.
When the information reception circuit of the power storage device receives an information signal related to an operation state informing that the second type electric device and the third type electric device perform a regenerative operation of sending surplus power to the wiring. 6. The DC power distribution system according to claim 5, wherein the power storage control circuit of the power storage device controls the power storage unit to absorb the surplus power. A connection control device for controlling connection between the DC power distribution system and the wiring;
The connection control device includes an information receiving circuit and a connection control circuit,
The information receiving circuit of the connection control device has received an information signal related to an operation state informing that the second type electric device and the third type electric device perform a regenerative operation for sending surplus power to the wiring. If
The connection control unit, a DC power distribution system according to claim 8, characterized in that cutting the connection between the wiring and the DC distribution system. The DC connection system according to claim 9 , wherein the connection control device includes a filter that prevents an information signal supplied to the wiring from flowing into the DC distribution system.

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