JP2010110056A - Power distribution system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power distribution system wherein it is possible to reduce the capacitance of a capacitor and yet stabilize applied voltage to a load. <P>SOLUTION: A mixing unit 7 rectifies alternating-current power from an alternating-current power source 3 at a rectification and conversion unit 6 and thereby converts the power into pulsating power. It mixes direct-current power from a direct-current power source E with the pulsating power and outputs the pulsating power or the mixed power, whichever is higher in voltage value, to a power conversion unit 15 located in a subsequent stage. At the power conversion unit 15, the mixed power of the pulsating power and the direct-current power is converted into direct-current power, which is outputted to a direct-current load through a mixed power distribution pathway L20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power distribution system that distributes DC power.

  2. Description of the Related Art Conventionally, various DC loads that operate by receiving DC power are provided. Of this type of DC load, one that is used by connecting to a general AC outlet that supplies AC power from a commercial power source or the like uses an external AC adapter that includes a rectifier circuit and converts AC to DC. Therefore, a configuration that can operate by supplying power from an AC outlet is adopted (for example, see Patent Document 1).

On the other hand, the present applicant converts electric power from a commercial power source into DC electric power by a large-capacity and high-efficiency AC / DC converter disposed in a distribution board such as a house, and is installed in each room. A DC distribution system that distributes DC power from a distribution board via a DC distribution path to a DC outlet such as a DC outlet having a pair of positive and negative power feeding units has been proposed (see, for example, Patent Document 2). When a DC load is used in this DC power distribution system, since the DC load is connected to the DC outlet and thus DC power is supplied instead of AC power, the AC adapter is not necessary. In addition, in this type of DC power distribution system, in order to suppress power consumption from the commercial power source, not only direct current power obtained by converting the power from the commercial power source but also private power generation such as solar cells and fuel cells. The use of DC power from the facility is also considered.
JP 2007-59156 A JP 2008-43000 A

  Incidentally, in the DC power distribution system described above, a capacitor that suppresses fluctuations in output voltage is generally provided at the output stage of the AC / DC converter in order to stabilize the voltage applied to the DC load. However, if a high voltage (for example, 100 to 200 V) is applied to the DC load, for example, when a high-voltage DC load is connected, the capacitor can be used as a capacitor in order to stabilize the output voltage of the AC / DC converter. It is necessary to use a capacitor having a large capacity and a high withstand voltage, and there is a problem that the AC / DC converter is hindered from being reduced in size and cost.

  The present invention has been made in view of the above reasons, and provides a power distribution system capable of stabilizing the voltage applied to a load while reducing the capacitance of a capacitor provided to suppress voltage fluctuation. The purpose is to do.

  The invention of claim 1 is connected to an AC power supply source for supplying AC power, a DC power supply source for supplying DC power, an AC power supply source and a DC power supply source, and AC power from the AC power supply source. By mixing the DC power from the DC power supply source with the pulsating current obtained by rectifying the pulsating current, the mixing unit that outputs the higher of the pulsating power and DC power, and the voltage fluctuation is suppressed A power converter that includes an output stage for converting the power output from the mixing unit into DC power, and a mixed distribution path that supplies the DC power output from the power conversion unit to a load. It is characterized by providing.

  According to this configuration, since the electric power obtained by mixing the pulsating flow and the direct current is input to the power conversion unit, the power conversion unit is compared with the case where only the pulsating flow is input to the power conversion unit. There is an advantage that it is possible to stabilize the voltage applied to the load output from the power converter while reducing the capacitance of the capacitor provided to suppress voltage fluctuation in the output stage. In addition, since the load is supplied with a mixture of pulsating power from the AC power supply source and DC power from the DC power supply source, a large current that cannot be covered by the DC power supply source alone. Even when the current flows to the load, there is also an advantage that the power can be stably supplied to the load by using the power from the AC power supply source together.

  According to a second aspect of the present invention, in the first aspect of the present invention, the DC voltage applied from the DC power supply source to the mixing unit is obtained by rectifying the AC voltage from the AC power supply source. The voltage is set to be smaller than the maximum value and larger than the minimum value.

  According to this configuration, since a part of the valley portion of the pulsating voltage is filled with the DC voltage in the mixing unit, the applied voltage to the power conversion unit is leveled and does not become zero. It is possible to stabilize the voltage applied to the load output from.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the mixing unit includes a power supply amount from the AC power supply source and a power supply amount from the DC power supply source to the power conversion unit. It has a distribution control part which carries out variable control of distribution of these.

  According to this configuration, the output distribution between the AC power supply source and the DC power supply source is variably controlled, so that it is possible to set the supply power according to the load capacity. Therefore, the DC power supply is not dependent on the load capacity. The source can be selected.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the distribution control unit is provided on a power supply path from the AC power supply source.

  According to this configuration, the distribution control unit only needs to be capable of transforming the AC voltage, and therefore, the output distribution between the AC power supply source and the DC power supply source can be controlled with a relatively simple configuration.

  The invention of claim 5 is the invention of claim 3, wherein the distribution control unit is provided on a power supply path from the DC power supply source.

  According to this configuration, since the distribution control unit controls the amount of power supplied from the DC power supply source, a solar cell or the like whose output is unstable compared to an AC power supply source such as a commercial power source is used as the DC power supply source. Even when used, there is an advantage that the amount of DC power supplied to the mixing section can be stabilized, and the output distribution between the AC power supply source and the DC power supply source is stabilized.

  According to a sixth aspect of the present invention, in any one of the third to fifth aspects of the present invention, the distribution control unit is electrically insulated on the input side and the output side.

  According to this configuration, even when one DC power supply source is shared by a plurality of loads, the plurality of loads are not short-circuited via the distribution control unit, and each load is operated independently. Therefore, it is not necessary to prepare a separate DC power supply source for each load.

  The invention of claim 7 is the invention according to any one of claims 1 to 6, wherein a plurality of the DC power supply sources are provided, and the mixing unit, the power conversion unit, and the mixed distribution path are connected to each DC power supply. It is characterized by being provided for each source.

  According to this configuration, by supplying power from a different DC power supply source for each load, the distribution of the power supply amount from the AC power supply source and the power supply amount from the DC power supply source is distributed to each DC power supply source. It can be set individually according to the power capacity of each.

  The invention according to claim 8 is the invention according to any one of claims 3 to 6, wherein a plurality of the DC power supply sources are provided, and the mixing unit, the power conversion unit, and the mixed distribution path are connected to each DC power supply. It is provided for each source, and the distribution control unit is provided in at least one mixing unit.

  According to this configuration, by supplying power from a different DC power supply source for each load, the distribution of the power supply amount from the AC power supply source and the power supply amount from the DC power supply source is distributed to each DC power supply source. It can be set individually according to the power capacity of each.

  According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the power conversion unit includes a power factor correction circuit that improves a power factor.

  According to this configuration, the power factor of the electric power supplied to the load can be improved. Even if a large current flows through the load, the generation of harmonic noise can be suppressed by the power factor correction circuit.

  The invention of claim 10 is the invention according to any one of claims 1 to 8, wherein the power conversion unit has a plurality of conversion circuits connected to the mixing unit and respectively converting to DC power and outputting. Features.

  According to this configuration, output voltages for a plurality of loads can be individually set in each conversion circuit.

  According to an eleventh aspect of the present invention, in any one of the first to eighth aspects, the power conversion unit is connected to the mixing unit and improves a power factor and one power factor correction circuit. And a plurality of conversion circuits for converting each output into DC power and outputting the same.

  According to this configuration, output voltages for a plurality of loads can be individually set in each conversion circuit. Further, the power factor of the power supplied to the load can be improved by the power factor correction circuit, and even if a large current flows through the load, the generation of harmonic noise can be suppressed.

  In the present invention, since power mixed with pulsating current and direct current is input to the power conversion unit, the output of the power conversion unit is compared with the case where only the pulsating current is input to the power conversion unit. There is an advantage that the voltage applied to the load output from the power converter can be stabilized while reducing the capacitance of the capacitor provided in the stage.

  As shown in FIG. 1, the power distribution system of the present embodiment is for supplying power to a load (electric equipment) in a house, and is installed at a predetermined location in the house and is an AC drive type load (hereinafter referred to as an AC load). An AC distribution board 1 for supplying AC power to a DC distribution board 2 for supplying DC power to a DC drive type load (hereinafter referred to as DC load) installed at a predetermined location in the house; It has.

  The AC distribution board 1 includes a main breaker 4 connected to an AC power supply source 3 via an AC lead-in line L1, and a plurality of branch breakers 5 connected to the main breaker 4 via AC conductive paths L2. And load circuits (including AC outlets installed in each room, wiring devices such as wall switches, lighting fixtures, etc.) corresponding to AC via each AC distribution line L3. By being connected, AC power can be supplied to each AC load (not shown). Here, the AC power supply source 3 is a single-phase three-wire commercial power source, and is an AC lead-in wire composed of three wires of a neutral electrode N (see FIG. 6) and a pair of voltage electrodes V1 and V2 (see FIG. 6). It is assumed that it is connected to the main breaker 4 through the road L1.

  The main breaker 4 includes a primary side terminal (not shown) to which the AC lead-in line L1 is connected, a secondary side terminal (not shown) to which the AC conductive path L2 is connected, and a primary side terminal-secondary. And a contact (not shown) inserted between the side terminals, and the power supply to the branch breaker 5 is turned on and off by the contact. Each branch breaker 5 is provided with a power supply terminal (not shown), and an AC of three poles (neutral pole N and a pair of voltage poles L1 and L2) connected to the secondary side terminal of the main breaker 4 is provided. The power supply terminal is electrically connected to the main breaker 4 in such a manner that only two poles of the conductive path L2 are connected. Therefore, AC 100V is supplied to the branch breaker 5 connected to the neutral electrode N and one of the voltage electrodes L1 and L2, and AC is supplied to the branch breaker 5 connected to the pair of voltage electrodes L1 and L2. 200V is supplied. Each branch breaker 5 is provided with a load terminal (not shown) for connecting the load circuit and a contact (not shown) interposed between the power supply terminal and the load terminal. To turn on / off the power supply to the load circuit.

  Here, in the present embodiment, the rectification converter (diode bridge) 6 connected to the load terminal of one branch breaker (here, a branch breaker to which AC 100 V is fed) 5 is used as the AC distribution board 1. The rectification conversion unit 6 is configured to rectify the alternating current into a full wave and convert it into a pulsating flow. This rectification conversion unit 6 constitutes a part of a mixing unit 7 to be described later.

  On the other hand, the DC distribution board 2 accommodates a plurality (three in this case) of branch protectors 8 connected to the DC power supply source E via the DC conductive path L10. A load circuit (including a DC outlet such as a DC outlet having a pair of positive and negative power feeding units installed in each room, a wiring device such as a wall switch, a lighting device, etc.) that supports direct current through the direct current distribution line L11 By being connected, DC power can be supplied to each DC load (not shown). The branch protector 8 monitors the current flowing through the DC distribution path L11, and restricts or cuts off the power supply to the DC load when an abnormality is detected.

  The direct-current power supply source E includes a solar cell 9 and a fuel cell 10 as a private power generation facility that generates direct-current power, and further a secondary battery 11. Is converted into a predetermined DC voltage by the voltage control unit 12 provided in the DC distribution board 2 and then input to the branch protector 8. Further, the DC power supply source E includes an AC / DC converter 13 including a switching power supply in the DC distribution board 2. The output of the AC / DC converter 13 is connected to the DC conductive path L10, and a part of the output of the AC power supply source 3 is input to the AC / DC converter 13 through the branch breaker 5 so DC power is output. The secondary battery 11 also includes a circuit unit for controlling charging / discharging, and is appropriately charged by the output of the solar cell 9, the fuel cell 10, and the AC / DC converter 13 (illustration of the charging path is omitted). 9, the fuel cell 10, and the AC / DC converter 13 are discharged as necessary when the power supply is stopped (for example, during a power failure).

  In the illustrated example, the voltage control unit 12 includes a DC / DC converter including a step-down chopper circuit that steps down and outputs a DC voltage, and is individually provided for each of the solar cell 9, the fuel cell 10, and the secondary battery 11. Is provided. Thus, a relatively low DC voltage (for example, 5 to 50 V) is applied to a DC load connected to the branch protector 8 via the DC distribution path L11 (hereinafter referred to as a weak electric system DC load). That is, in the weak electric system direct current load connected to the direct current distribution line L11, direct current power is directly supplied, and an AC adapter for converting alternating current into direct current is not necessary. Here, the voltage control unit 12 has a function of controlling the distribution of power from the solar cell 9, the fuel cell 10, and the secondary battery 11 to the weak electric system DC load. Further, each voltage control unit 12 is provided with a backflow prevention function by a diode or the like so that current does not flow back from the output side of each voltage control unit 12. Note that the voltage control unit 12 is not limited to a unit that steps down and outputs a direct current voltage, and may be a unit that outputs a stepped up or stepped down direct current voltage, and is appropriately designed according to a weak electric system direct current load.

  Further, as a modification of the present embodiment, it is also possible to adopt a configuration in which the outputs of the solar cell 9 and the fuel cell 10 are temporarily stored in the secondary battery 11 and then output to the voltage control unit 12 as shown in FIG. It is done. Specifically, the solar cell 9 and the fuel cell 10 are connected to the secondary battery 11 via the charging circuit 14 that controls the charging current of the secondary battery 11, and the output of the secondary battery 11 is input to the voltage control unit 12. Connect to the side. In this case, the voltage control unit 12 is provided only for the secondary battery 11.

  By the way, in the power distribution system of this embodiment, in addition to the power supply to the AC load described above and the power supply to the weak power system DC load, a DC load (hereinafter referred to as a 100 to 200 V) DC voltage (hereinafter referred to as a DC voltage) is driven. DC power can also be supplied to a high-voltage DC load).

  Specifically, as shown in FIG. 1, in order to mix the pulsating power obtained by rectifying the AC power from the AC power supply source 3 by the rectification converter 6 and the DC power from the DC power supply source E. The mixing unit 7 is provided in the AC distribution board 1, and a power conversion unit 15 that converts electric power obtained by mixing pulsating current and direct current (hereinafter referred to as mixed power) into direct current power is output from the mixing unit 7. On the side. The mixing unit 7 has a connection unit 16 in the AC distribution board 1 for connecting the output of the rectification conversion unit 6 and the DC conductive path L10 to the input of the power conversion unit 15. Here, the connecting portion 16 has a high potential point 16a to which the high potential side (positive electrode) of the DC conductive path L10 is connected and a low potential point 16b to which the low potential side (negative electrode) of the DC conductive path L10 is connected. At the high potential point 16a, the output of the rectification conversion unit 6 and the DC conductive path L10 are connected so as to connect the high potential sides to each other. At the low potential point 16b, the output of the rectification conversion unit 6 and the DC The conductive path L10 is connected so that the low potential sides are connected to each other.

  Here, the magnitude of the DC voltage applied to the connection portion 16 from the DC conductive path L10 side is set to a magnitude between the minimum value and the maximum value of the pulsating voltage applied to the connection portion 16. Therefore, the voltage waveform input from the connection unit 16 to the power conversion unit 15 has a form in which a part of the valley portion of the pulsating flow is filled with direct current as shown in FIG. In short, since the pulsating voltage and the DC voltage are simultaneously applied to the connecting portion 16 as shown by the broken line in FIG. 3, the pulsating power and the direct current are applied to the power converter 15 as shown by the solid line in FIG. Of the power, the power having the higher voltage value is supplied. Note that DC power is supplied to the power converter 15 during the period indicated by “DC” in FIG. 3, and pulsating power is supplied to the power converter 15 during the period indicated by “AC” in FIG. It becomes.

  Furthermore, the mixing unit 7 includes a distribution control unit 17 between the DC conductive path L10 and the connection unit 16 for variably controlling the distribution of the direct current input to the connection unit 16 and the pulsating flow. The distribution control unit 17 is a DC / DC converter that is provided in the DC distribution board 2 and converts the output voltage of the voltage control unit 12 into a DC voltage of a desired magnitude, and the pulsating current applied to the connection unit 16. The output voltage is variably controlled within a range between the minimum value and the maximum value of the voltage.

  As a modification of the present embodiment, as shown in FIG. 4 (in FIG. 4, the DC power supply source E is illustrated in a simplified manner), a distribution control unit 18 is provided in the previous stage (input side) of the rectification conversion unit 6. Is also possible. In this case, the distribution control unit 18 converts the AC voltage into a predetermined magnitude and then outputs the AC voltage to the rectification conversion unit 6, and includes a voltage variable transformer (Slidac (registered trademark)), or an inverter circuit and a resonance circuit. A circuit combining these is used. In the latter configuration, the output voltage can be variably controlled by variably controlling the drive frequency of the inverter circuit with respect to the resonance frequency of the resonance circuit. Thus, by providing the distribution control unit 18 on the power supply path from the AC power supply source 3, the configuration of the distribution control unit 18 can be simplified. In the example of FIG. 4, the distribution control units 17 and 18 are provided on the power supply path from the DC power supply source E and on the power supply path from the AC power supply source 3, respectively. A control unit 18 may be provided.

  Here, in order to prevent a current from flowing backward from the connection unit 16 to the AC power supply source 3 side and the DC power supply source E side, the mixing unit 7 is provided with a backflow prevention unit. In this embodiment, the rectification conversion unit (diode bridge) 6 is also used as an AC side backflow prevention unit, and the distribution control unit 17 is also used as a DC side backflow prevention unit by providing a diode in the distribution control unit 17. Is done.

  In addition, the power conversion unit 15 includes a power factor correction circuit (PFC) 19 for improving the power factor, and a conversion circuit 20 that converts the output voltage to a desired magnitude in the subsequent stage of the power factor improvement circuit 19. The high-voltage DC load 21 (see FIG. 5) is connected to the output of the conversion circuit 20 via the mixed distribution line L20. As a result, the mixed power mixed at the connection unit 16 is supplied to the high-voltage DC load 21 through the power factor correction circuit 19 and the conversion circuit 20. Here, the conversion circuit 20 is composed of a DC / DC converter that converts a DC voltage into a DC voltage of a predetermined magnitude and outputs the DC voltage, and suppresses fluctuations in the output voltage and applies it to the high-voltage DC load 21. A capacitor (not shown) for stabilizing the applied voltage is provided in the output stage. In FIG. 1, the power factor improvement circuit 19 and the conversion circuit 20 are shown separately. However, for example, when a chopper circuit is used as the conversion circuit 20, the chopper circuit may be used as the power factor improvement circuit 19. Is possible.

  According to the power distribution system having the configuration described above, since the mixed power formed by mixing the pulsating current and the direct current is input to the power conversion unit 15 at the connection unit 16, the input voltage of the power conversion unit 15 is leveled. As a result, the output voltage of the power converter 15 can be stabilized as compared with the case where only the pulsating current is input to the power converter 15 (see FIG. 3). Therefore, it is possible to stabilize the DC voltage applied to the strong DC load 21 while using a capacitor having a relatively small capacity as the capacitor provided in the output stage of the power conversion unit 15. Moreover, since the mixed electric power which mixed the electric power from the alternating current power supply source 3 and the electric power from the direct current power supply source E is supplied to the high voltage system DC load 21, it can be covered only by the direct current power supply source E. Even if a large amount of current flows to the high-voltage DC load 21, stable power supply can be performed by using the power from the AC power supply source 3.

  Here, when using the power distribution system of the present embodiment, as shown in FIG. 5, a plurality of conversion circuits 20 are connected in parallel to the output of the power factor correction circuit 19, and the output of each conversion circuit 20 is a strong power. It is conceivable to connect the system DC load 21. In this case, one power factor correction circuit 19 can be shared by a plurality of high-voltage DC loads 21, and by setting the output voltage of each conversion circuit 20 individually, a plurality of units with different rated voltages can be used. The high-voltage DC load 21 can be used simultaneously. Further, a plurality of high-voltage DC loads 21 can be connected in parallel to the output of one conversion circuit 20. Note that the power factor correction circuit 19 can be omitted if necessary.

  By the way, in the said embodiment, although the example which provided the rectification | straightening conversion part 6 and the connection part 16 in the back | latter stage of the branch breaker 5 to which alternating current 100V is fed was shown, it is not restricted to this example, and the branch breaker 5 to which alternating current 200V is fed. You may make it provide the rectification | straightening conversion part 6 and the connection part 16 in the back | latter stage.

  Further, as shown in FIG. 6, a connecting portion is formed by using all of the AC conductive path L2 of three poles (neutral pole N and a pair of voltage poles V1 and V2) connected to the secondary terminal of the main breaker 4. It is also conceivable to generate a pulsating flow that is input to 16. In the example of FIG. 6, each of the AC conductive paths L2 of the pair of voltage electrodes V1 and V2 is connected to the high potential point 16a in the connection portion 16 via the diodes D1 and D2, and the AC conductive path L2 of the neutral pole N is The diodes D1 and D2, which are directly connected to the low potential point 16b in the connection unit 16 and inserted in the AC conductive paths L2 of the voltage electrodes V1 and V2, respectively function as a rectification conversion unit and a backflow prevention unit. In the example of FIG. 6, the DC side distribution control unit 17 is omitted, and only the diode D <b> 3 as a backflow prevention unit is inserted between the DC power supply source E and the connection unit 16.

  In this case, as shown in FIG. 7 (FIG. 7 shows the DC power supply source E in a simplified manner), the connection portion 16 has a voltage between one voltage pole V1 and the neutral pole N and the other voltage. Since the voltage between the pole V2 and the neutral pole N is alternately applied, as a result, mixed power of pulsating current and direct current is output to the power converter 15. In the period indicated by “DC” in FIG. 7, a current flows from the DC power supply source E to the power conversion unit 15. In the period indicated by “AC1” in FIG. 7, one voltage pole V1 and the neutral pole are supplied. A current flows from the AC conductive path L2 of N to the power conversion unit 15, and during the period indicated by “AC2” in FIG. 7, a current flows from the AC conductive path L2 of the other voltage electrode V2 and the neutral electrode N to the power conversion unit 15. Will flow.

  Furthermore, it is also possible to realize a power distribution system having a configuration in which the AC / DC converter 13 in the DC distribution board 2 is omitted as shown in FIG. In this power distribution system, a path for supplying power from the branch breaker 5 in the AC distribution board 1 to the AC / DC converter 13 in the DC distribution board 2 is not required. In the example of FIG. 8, the DC-side distribution control unit 17 is omitted, and the voltage control unit 12 that controls the magnitude of the output voltage to the branch protector 8 is used instead of the distribution control unit 17 and the DC power supply source E The diode D3 inserted between the connection part 16 and the connection part 16 is used as a backflow prevention part.

  In addition, although the example which provides the mixing part 7 in the alternating current distribution panel 1 was shown in the said embodiment, not only this example but the mixing part 7 is accommodated in the housing | casing different from the alternating current distribution board 1. For example, it is conceivable to store the mixing unit 7 in the DC distribution board 2 or in the same casing as the power conversion unit 15.

(Embodiment 2)
The power distribution system according to the present embodiment is different from the power distribution system according to the first embodiment in that a plurality of (two in this case) mixing units 7 and power conversion units 15 are provided as shown in FIG.

  According to the power distribution system of the present embodiment, the mixed power distribution path L20 can be divided into a plurality of systems (here, two systems), and the high power system DC load 21 can be connected to each mixed power distribution path L20. Here, the magnitude of the voltage applied from each of the mixed distribution lines L20 to the high-voltage DC load 21 can be arbitrarily set by the power conversion unit 15 provided for each of the mixed distribution lines L20. The output voltage can be individually adjusted according to the load capacity of the high-voltage DC load 21 connected to L20. Further, since the distribution control unit 17 provided for each mixing unit 7 can arbitrarily adjust the distribution between the pulsating flow and the direct current, the electric power according to the load capacity of the high-voltage direct current load 21 connected to the mixed distribution line L20. It is also possible to adjust the distribution individually.

  FIG. 10 exemplifies a modification of the present embodiment in which three rectification conversion units 6 and three mixing units 7 are provided and the mixed distribution path L20 is divided into three systems (in FIG. 10, AC The power supply source 3 and the DC power supply source E are illustrated in a simplified manner). In the example of FIG. 10, not only the distribution control unit 17 is provided on the power supply path from each DC power supply source E, but also the distribution control unit 18 is provided at the preceding stage of each rectification conversion unit 6. Yes.

  By the way, when a plurality of mixed power distribution paths L20 are employed as in the present embodiment, if one DC power supply source E is shared by the plurality of mixed power distribution paths L20, each distribution control section 17 on the DC side is used. There is a possibility that a short circuit may occur between the high-voltage DC loads 21 connected to the mixed distribution path L20. Therefore, as shown in FIG. 11, when one DC power supply source E is shared by a plurality of mixed power distribution paths L20, it is desirable to electrically insulate the input and output of the distribution control unit 17 on the DC side. .

  That is, it is possible to prevent a short circuit from occurring through the distribution control unit 17 by insulating the input / output (between the primary side and the secondary side of the insulation transformer) using an isolation transformer in the distribution control unit 17. Further, depending on the load capacity of the high-voltage DC load 21, a plurality of DC power supply sources E may be used. However, even in this case, the number of connectable DC power supply sources E is not limited by wiring.

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

1 is a schematic system configuration diagram showing Embodiment 1 of the present invention. It is a schematic system block diagram which shows the modification same as the above. It is explanatory drawing which shows the output voltage of a mixing part same as the above. It is a schematic system block diagram of the principal part which shows the modification same as the above. It is a schematic system block diagram of the principal part which shows the connection example of load same as the above. It is a schematic system block diagram of the principal part which shows the modification same as the above. It is explanatory drawing which shows the output voltage of a mixing part same as the above. It is a schematic system block diagram which shows the modification same as the above. It is a schematic system block diagram which shows Embodiment 2 of this invention. It is a schematic system block diagram of the principal part which shows the modification same as the above. It is a schematic system block diagram of the principal part which shows the modification same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 AC power supply source 6 Rectification conversion part 7 Mixing part 15 Power conversion part 17, 18 Distribution control part 19 Power factor improvement circuit 20 Conversion circuit 21 (High power system direct current) Load E DC power supply source L20 Mixed distribution circuit

Claims (11)

  An AC power supply source for supplying AC power, a DC power supply source for supplying DC power, a pulse obtained by rectifying AC power from the AC power supply source, connected to the AC power supply source and the DC power supply source By mixing the DC power from the DC power supply source with the flowing power, a mixing unit that outputs the higher voltage value of the pulsating power and DC power, and a capacitor for suppressing voltage fluctuations in the output stage A power conversion unit that converts the power output from the mixing unit into DC power and outputs the DC power output from the power conversion unit to a load. system.   The DC voltage applied from the DC power supply source to the mixing unit is set to be smaller than the maximum value of the pulsating voltage obtained by rectifying the AC voltage from the AC power supply source and larger than the minimum value. The power distribution system according to claim 1.   The said mixing part has a distribution control part which variably controls distribution of the power supply amount from the said AC power supply source with respect to the said power conversion part, and the power supply amount from the said DC power supply source, The said control part is characterized by the above-mentioned. The power distribution system according to claim 1 or claim 2.   The power distribution system according to claim 3, wherein the distribution control unit is provided on a power supply path from the AC power supply source.   The power distribution system according to claim 3, wherein the distribution control unit is provided on a power supply path from the DC power supply source.   The power distribution system according to any one of claims 3 to 5, wherein the distribution control unit is electrically insulated from an input side and an output side.   7. The DC power supply source according to claim 1, wherein a plurality of the DC power supply sources are provided, and the mixing unit, the power conversion unit, and the mixed power distribution path are provided for each DC power supply source. The power distribution system according to any one of the above.   A plurality of the DC power supply sources are provided, the mixing unit, the power conversion unit, and the mixed power distribution path are provided for each DC power supply source, and the distribution control unit is provided in at least one mixing unit. The power distribution system according to claim 3, wherein the power distribution system is provided.   The power distribution system according to any one of claims 1 to 8, wherein the power conversion unit includes a power factor correction circuit that improves a power factor.   The power distribution system according to any one of claims 1 to 8, wherein the power conversion unit includes a plurality of conversion circuits that are connected to the mixing unit and respectively convert and output to DC power. The power conversion unit includes a power factor improvement circuit that is connected to the mixing unit and improves a power factor, and a plurality of conversion circuits that convert the output of one power factor improvement circuit into DC power and output the DC power. The power distribution system according to any one of claims 1 to 8, wherein the power distribution system is characterized.

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