JP2012244743A - Electric power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power unit capable of supplying power with large voltage and large current to a load even when input is small power.SOLUTION: An electric power unit 1 provided with an accumulator battery 30 capable of supplying power to a load 60 includes: a first power supply part 10 capable of supplying power with low voltage and large current to the accumulator battery; a second power supply part 40 capable of supplying power with high voltage whose potential is higher than that of the first power supply part and small current whose current value is smaller than that of the first power supply part to the accumulator battery; first connection opening/closing parts 20A and 20B capable of connecting the first power supply part to the accumulator battery; and second connection opening/closing parts 50A and 50B capable of connecting the second power supply part and the load to the accumulator battery and being alternately opened/closed with the first connection opening/closing parts. Charge of the accumulator battery is completed by the power from the first power supply part by closing the first connection opening/closing parts and opening the second connection opening/closing parts and then, the power is supplied to the load from the accumulator battery and the second power supply part by opening the first connection opening/closing parts and closing the second connection opening/closing parts.

Description

  The present invention relates to a power supply device provided with a storage battery capable of supplying power to a load.

  For example, Non-Patent Document 1 discloses a multiple inverter type power supply device that combines the outputs of a plurality of unit inverters on the secondary side of a transformer. In the power supply device of Non-Patent Document 1, by connecting the secondary side of the transformer connected to the output of each unit inverter in series, the output voltage of the secondary side connected in series is changed to the secondary side of each transformer. It is possible to sum the alternating voltages.

Authored by Takao Okada and three others, "University Course Electrical Equipment (2) (2nd revised edition)" Ohm Co., Ltd., May 15, 1995, p53

  However, for example, one unit inverter of a plurality of unit inverters and a transformer connected thereto have a capability of supplying a small current at a high voltage, and the other unit inverter and a transformer connected thereto have a low voltage. The voltage supplied to the load from the secondary side of the transformer connected in series can be made high by combining the two voltages with different potentials, while having the ability to supply a large current with a series connection. The current supplied to the load from the secondary side of the transformer was not able to be taken out as a large current according to the capacity of the other unit inverter and the transformer connected to the other unit inverter only by making it proportional to the load. Furthermore, the current supplied to the load from the secondary side of the transformer connected in series cannot be a large current obtained by combining two currents having different current values.

  The present invention has been proposed in view of such a situation, and an object thereof is to provide a power supply device capable of supplying high-voltage and large-current power to a load.

  A power supply device according to the invention of claim 1 is a power supply device provided with a storage battery capable of supplying power to a load, wherein the storage battery is provided with a first power supply unit capable of supplying a large current with a low voltage. A second power supply unit capable of supplying the storage battery with a high voltage having a higher potential than the first power supply unit and a small current having a current value smaller than that of the first power supply unit; and A first connection opening / closing part capable of connecting the first power supply part, and a second connection capable of connecting the second power supply part and the load to the storage battery and capable of opening / closing alternately with the first connection opening / closing part. An opening / closing part, and closing the first connection opening / closing part and opening the second connection opening / closing part, and after the charging of the storage battery is completed by the electric power from the first power supply part, By opening the connection opening and closing part and closing the second connection opening and closing part, the storage battery and the And a second power source unit and supplying power to the load.

  A second aspect of the present invention is the first connection opening / closing section according to the first aspect, comprising two or more of the storage batteries, wherein the first connection opening / closing section is capable of connecting one storage battery and the first power supply section. And another first connection opening / closing part capable of connecting the other storage battery and the first power supply unit, wherein the one first connection opening / closing part and the other first connection opening / closing part are alternately arranged. Provided to be openable and closable, the second connection opening and closing unit is connected to the one storage battery, the second connection opening and closing unit capable of connecting the second power supply unit and the load, and the other storage battery, And a second connection opening / closing part capable of connecting the second power supply part and the load, wherein the one second connection opening / closing part and the other second connection opening / closing part can be alternately opened / closed. The power from the first power supply unit is provided by closing the one first connection opening / closing part and opening the one second connection opening / closing part. Therefore, after charging of the one storage battery is completed, the one first connection opening / closing part is opened and the one second connection opening / closing part is closed, so that the one storage battery and the second power supply part By the first charging / discharging operation for supplying power to the load, and closing the other first connection opening / closing part and opening the other second connection opening / closing part, the electric power from the first power supply part After the charging of the other storage battery is completed, by opening the other first connection opening / closing part and closing the other second connection opening / closing part, the other storage battery and the second power supply part A second charge / discharge operation for supplying power to the load is alternately performed.

  According to a third aspect of the present invention, in the second aspect of the present invention, the first power supply unit receives the single-phase AC power as an external power supply and generates the large-current DC power at the low voltage. The plurality of first direct current power supply units are connected to the one storage battery and the other by the one first connection opening / closing unit and the other first connection opening / closing unit. It is possible to connect alternately to the storage battery.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the second power source unit inputs a single-phase AC power or a multi-phase AC power as an external power source, and the small current at the high voltage. The second DC power supply unit is formed by a second DC power supply unit that generates a direct current power, and the second DC power supply unit limits the AC current supplied from the external power supply to the current value of the small current. And a rectifier that rectifies the output of the AC current limiter, and a smoother that smoothes the output of the rectifier and outputs the DC small current.

  According to a fifth aspect of the present invention, in any one of the first to third aspects, the second power source unit inputs a single-phase AC power or a multi-phase AC power as an external power source, and the small current at the high voltage. The third DC power supply unit rectifies the input AC power, and smoothes the output of the rectifier unit to generate a DC current. A smoothing unit that outputs a DC current limiting unit that controls the conduction state according to an output control signal, restricts the passage of the DC current output by the smoothing unit, and outputs the small current. It is characterized by providing.

  According to a sixth aspect of the present invention, in any one of the first to third aspects, the second power source unit inputs a single-phase AC power or a multi-phase AC power as an external power source, and the small current at the high voltage. Formed by a fourth DC power supply unit that generates a DC power of the rectifier, and the fourth DC power supply unit includes a rectifier bridge that full-wave rectifies the single-phase or multiphase AC power, And connected in series on the input side to the rectifying element located between the input side and the output side, and the conduction state is controlled in accordance with the output control signal, and the alternating current supplied by the external power source is pulsated. A direct current limiting unit that converts the direct current to limit the passage of the pulsating direct current, and a smoothing unit that smoothes the output of the direct current limiting unit and outputs the small current. And

  A seventh aspect of the present invention is the method according to any one of the first to third aspects, wherein the second power source unit inputs DC power as an external power source and generates the small current DC power at the high voltage. The fifth DC power supply unit is formed by a DC power supply unit, and the conduction state is controlled by an output control signal to restrict the passage of the DC current supplied from the external power supply and output the small current. A direct current limiting unit is provided.

According to the power supply device of the first aspect of the present invention, when the first connection opening / closing part is opened and the second connection opening / closing part is closed after the charging of the storage battery is completed, the storage voltage (low voltage) of the storage battery and the second The supply voltage (high voltage) of the power supply unit is synthesized inside the storage battery, and the storage current (large current) of the storage battery and the supply current (small current) of the second power supply unit are synthesized inside the storage battery. it can. However, since the storage battery and the second power supply unit are connected in series, the storage current and the supply current are combined without being added together inside the storage battery. Then, the synthesized large current is discharged from the storage battery. Therefore, the power supply device can supply high-voltage and large-current power to the load.
According to the invention of claim 2, by alternately performing a first charge / discharge operation using one of the two or more storage batteries and a second charge / discharge operation using another storage battery, It becomes possible to supply high-voltage and large-current power to the load without interruption.
According to the invention of claim 3, in addition to inputting single-phase AC power to each first DC power supply unit, multi-phase AC power is input to a plurality of first DC power supply units connected in parallel. As a result, each first DC power supply unit can generate DC power. Furthermore, it becomes possible to alternately charge one storage battery and another storage battery with the DC power generated by the first DC power supply unit.
According to the fourth aspect of the present invention, after limiting the passage of the alternating current supplied from the external power source by the alternating current limiting unit, the power of the pulsating current waveform generated by the rectifying unit is smoothed by the smoothing unit and the direct current A small current can be produced. Therefore, the second DC power supply unit can easily generate a small DC current from an AC external power supply.
According to the fifth aspect of the present invention, the DC current limiting unit of the third DC power supply unit can adjust the passing current amount by controlling the conduction state according to the output control signal. Therefore, it becomes easy to adjust the current value of the small current output from the DC current limiting unit according to the output control signal.
According to the invention of claim 6, the fourth DC power supply unit includes a DC current limiting unit that converts an alternating current supplied from an external power source into a pulsating direct current and restricts the passage of the pulsating direct current. In the combined rectification bridge, both the adjustment of the passing current amount of the pulsating direct current and the full-wave rectification of the AC power supplied from the external power source can be performed.
According to the seventh aspect of the present invention, the direct current supplied from the external power source can be converted into a small current with a reduced current value by the direct current limiter capable of controlling the conduction state. Therefore, the fifth DC power supply unit can convert the DC current supplied from the external power source into a small current with a simple configuration using the DC current limiting unit.

It is a schematic circuit block diagram of the power supply device of Embodiment 1 of this invention. FIG. 3 is a schematic circuit configuration diagram of a power supply device according to a second embodiment. FIG. 6 is a schematic circuit configuration diagram of a power supply device according to a third embodiment. It is a schematic circuit block diagram of the 2nd power supply part with which the power supply device of Embodiment 4 is provided. FIG. 10 is a schematic circuit configuration diagram of a second power supply unit included in the power supply device of the fifth embodiment. It is a schematic circuit block diagram of the 2nd power supply part with which the power supply device of Embodiment 6 is provided.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the power supply device 1 includes a first power supply unit 10, first connection opening / closing units 20A and 20B, a first storage battery 30, a second power supply unit 40, and a second connection opening / closing unit 50A. , 50B.

  The first power supply unit 10 functions as a low-voltage and large-current power supply, and includes a low-voltage transformer 11 and a single-phase full-wave rectifier bridge 12. The primary side winding of the low voltage transformer 11 is connected to the input side terminals 10 a and 10 b of the first power supply unit 10. The secondary winding of the low voltage transformer 11 is connected to the input terminals 12 a and 12 b of the single-phase full-wave rectifier bridge 12. The output terminals 12 c and 12 d of the single-phase full-wave rectification bridge 12 are connected to the output-side positive terminal 10 c and the output-side negative terminal 10 d of the first power supply unit 10.

  The first connection opening / closing portions 20A and 20B are formed by opening / closing switches. The first connection opening / closing unit 20 </ b> A is connected in series between the output-side positive terminal 10 c of the first power supply unit 10 and the positive terminal 30 a of the first storage battery 30. On the other hand, the first connection opening / closing unit 20 </ b> B is connected in series between the output-side negative terminal 10 d of the first power supply unit 10 and the negative terminal 30 b of the first storage battery 30. The first storage battery 30 is formed by connecting a plurality of storage battery cells in series. Examples of the first storage battery 30 include a lithium ion storage battery and a nickel hydride storage battery. In addition, the positive electrode of the smoothing capacitor 13 is connected between the output-side positive terminal 10c and the first connection opening / closing part 20A, and the negative electrode of the smoothing capacitor 13 is connected to the output-side negative terminal 10d and the first connection opening / closing part 20B. Connected between.

  The second power supply unit 40 functions as a small current power supply having a higher voltage than the first power supply unit 10 and a current value smaller than that of the first power supply unit 10. And a rectifying unit 42 and a smoothing unit 43. The second power supply unit 40 is an example of a second DC power supply unit of the present invention. The AC current limiting unit 41 includes three AC reactors for current limiting, and each AC reactor is connected between the input side terminals 41a to 41c and the output side terminals 41d to 41f of the current limiting unit 41, respectively. Yes.

  In this embodiment, the rectifier 42 is formed by a three-phase full-wave rectifier bridge. The three-phase full-wave rectification bridge is composed of six diodes D1 to D6. The anode of the diode D1 and the cathode of the diode D2 are connected in series, the anode of the diode D3 and the cathode of the diode D4 are connected in series, and the anode of the diode D5 and the cathode of the diode D6 are connected in series. The output side terminal 41d of the current limiting unit 41 is connected in parallel between the anode of the diode D1 and the cathode of the diode D2, and the output side terminal 41e is connected in parallel between the anode of the diode D3 and the cathode of the diode D4. The output side terminal 41f is connected in parallel between the anode of the diode D5 and the cathode of the diode D6.

  Further, the cathodes of the diodes D1, D3, and D5 are connected in parallel to each other, and the anodes of the diodes D2, D4, and D6 are connected in parallel to each other. The cathodes of the diodes D1, D3, and D5 are connected to the output-side positive terminal 42a of the rectifying unit 42, and the anodes of the diodes D2, D4, and D6 are connected to the output-side negative terminal 42b of the rectifying unit 42.

  The smoothing unit 43 is formed by a smoothing circuit in which a reactor L1 is connected between two capacitors C1 and C2 connected in parallel. The positive electrode of the capacitor C1 is connected to the output-side positive terminal 42a of the rectifier 42, and the negative electrode of the capacitor C1 is connected to the output-side negative terminal 42b. The positive electrode of the capacitor C2 is connected to the output-side positive terminal 40c of the second power supply unit 40, and the negative electrode of the capacitor C2 is connected to the output-side negative terminal 40d of the second power supply unit 40.

  The second connection opening / closing part 50 </ b> A is connected in series between the output-side positive terminal 40 c and the negative terminal 30 b of the first storage battery 30. On the other hand, the second connection opening / closing part 50 </ b> B is connected in series between the positive electrode terminal 30 a of the first storage battery 30 and the load connection positive electrode terminal 1 a of the power supply device 1. The output-side negative terminal 40 d of the second power supply unit 40 is connected in series to the load connection negative terminal 1 b of the power supply device 1. A load 60 such as a DC motor is connected between the load connection positive terminal 1a and the load connection negative terminal 1b.

  Next, the operation of the power supply device 1 (at the time of output load) will be described. When single-phase AC power is supplied from the external power source to the input-side terminals 10a and 10b of the first power supply unit 10, the AC voltage is stepped down by the low voltage transformer 11 to increase the AC current. Subsequently, the AC power supplied from the low voltage transformer 11 is converted into DC power having a low voltage and a large current by being smoothed by the smoothing capacitor 13 after being full-wave rectified by the single-phase full-wave rectification bridge 12. DC power of low voltage and large current is supplied to the first storage battery 30 in a state where the first connection opening / closing sections 20A, 20B are closed and the second connection opening / closing sections 50A, 50B are opened. Thereby, the 1st storage battery 30 is charged.

  On the other hand, when a single-phase or multi-phase (for example, three-phase) AC power is supplied from an external power source to the AC current limiting unit 41 provided in the second power source unit 40 through the input side terminals 41a to 41c, an AC reactor is provided. The AC current passing through the current limiting unit 41 is limited to a small current within a predetermined value. The AC voltage value supplied from the AC reactor is substantially the same as the AC voltage value supplied from the external power source to the input terminals 41a to 41c. Subsequently, the AC power supplied from the current limiter 41 is full-wave rectified by the rectifier 42. After that, the smoothing unit 43 smoothes the full-wave rectified power of the pulsating waveform, thereby generating high-voltage and small-current DC power.

  After the charging of the first storage battery 30 by the first power supply unit 10 is completed, the second power supply unit 40 is opened in a state where the first connection opening / closing units 20A and 20B are opened and the second connection switching units 50A and 50B are closed. The high-voltage and small-current DC power is supplied to the first storage battery 30. Thereby, the storage voltage (low voltage) of the first storage battery 30 and the DC voltage (high voltage) supplied from the second power supply unit 40 are combined inside the first storage battery 30. In addition, a direct current (small current) is supplied from the second power supply unit 40 having a higher potential than the first storage battery 30 to the negative electrode terminal 30b of the first storage battery 30, whereby the storage current of the first storage battery 30 is stored. The (large current) and the small current are combined inside the first storage battery 30. Then, the power supply device 1 supplies a direct current proportional to the load to the load 60. Therefore, a direct current obtained by combining the storage current (large current) of the first storage battery 30 and the current (small current) supplied from the second power supply unit 40 inside the first storage battery 30 with respect to the load 60. It becomes possible to supply.

  Below, the experimental result of the power supply device 1 is demonstrated. The low voltage transformer 11 has a capacity of 600 W and a winding ratio of 5: 1. The single-phase full-wave rectification bridge 12 was set to have a withstand voltage of 25V and an allowable current of 35A. The first storage battery 30 was a lithium ion storage battery (capacity 10 Ah, voltage 22 V). For the load 60, a resistor having a resistance value of 4 ohms was used. Further, the passing current of the power supply device 1 was limited to about 5 A by the AC reactor for current limitation in the AC current limiting unit 41.

  When single-phase AC power having a voltage value of 101.2 V and a current value of 6.47 A is supplied to the input-side terminals 10 a and 10 b of the first power supply unit 10, the first power supply unit 10 has a voltage value of 19. DC power having a current value of 30.9 A at 4 V was generated, and this DC output was applied to the first storage battery 30. With this DC power, the discharge voltage value of the first storage battery 30 reached 18.3V. On the other hand, when single-phase AC power having a voltage value of 101.2 V and a current value of 5.2 A is supplied to the AC current limiting unit 41 provided in the second power supply unit 40, the second power supply unit 40 DC power having a value of 86V and a current value of 4.63A was generated.

  After charging of the first storage battery 30 (lithium ion storage battery) is completed, the load connection positive electrode terminal 1a and the load are connected in a state where the first connection opening / closing sections 20A, 20B are opened and the second connection opening / closing sections 50A, 50B are closed. The voltage value between the connecting negative terminal 1b is the discharge voltage value (18.3V) of the first storage battery 30 and the DC voltage value (86V) supplied from the second power supply unit 40. It was a total value (104.3V = 18.3V + 86V). Furthermore, the current value supplied to the first storage battery 30 by the second power supply unit 40 is 4.63 A, and the current value supplied to the load 60 is the current value (4.63 A) and the discharge of the first storage battery 30. It was a combined value (26.1 A) with the current value. Therefore, the total output power of the power supply device 1 is about 2722 VA (= 104.3 V × 26.1 A) for direct current, and the total input power of the power supply device 1 is about 1181 W (= {101.2 V × 6.47 A} + for alternating current). {101.2V × 5.2A}).

<Effect of Embodiment 1>
In the power supply device 1 of the present embodiment, after the first storage battery 30 is fully charged, the first storage battery 30 is opened when the first connection opening / closing sections 20A, 20B are opened and the second connection opening / closing sections 50A, 50B are closed. And the DC voltage (high voltage) supplied from the second power supply unit 40 are combined inside the first storage battery 30 and the storage current (large current) of the first storage battery 30. ) And the current (small current) supplied from the second power supply unit 40 can be combined within the first storage battery 30 without being added together. Therefore, it is possible to supply high-voltage and large-current power to the load 60.

  In the second power supply unit 40, the smoothing unit 43 converts the pulsating waveform power that has been full-wave rectified by the rectifying unit 42 after the AC current limiting unit 41 restricts the passage of the alternating current supplied from the external power source. Smoothing can produce a small direct current. Therefore, the second power supply unit 40 can easily generate a small DC current from an AC external power supply.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. Here, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. As illustrated in FIG. 2, the power supply device 1 </ b> A includes a first power supply unit 10 </ b> A, first connection opening / closing units 20 </ b> A to 20 </ b> D, a first storage battery 30, a second storage battery 31, and a second power supply unit 40. 2nd connection opening-and-closing part 50A-50D is provided. The first connection opening / closing sections 20A and 20B are examples of one first connection opening / closing section of the present invention, and the first connection opening / closing sections 20C and 20D are examples of other first connection opening / closing sections of the present invention. The first storage battery 30 is an example of one storage battery of the present invention, and the second storage battery 31 is an example of another storage battery of the present invention. Furthermore, the second connection opening / closing parts 50A and 50B are examples of the second connection opening / closing part of the present invention, and the second connection opening / closing parts 50C and 50D are examples of the other second connection opening / closing part of the present invention.

  10 A of 1st power supply parts operate | move as a power supply of a low voltage large current, and are provided with the low voltage transformer 11A and the three-phase full wave rectification bridge 12A. The low-voltage transformer 11A is formed by a three-phase transformer having both a single-phase output and a three-phase output. The primary side winding of the low voltage transformer 11A is connected to the input side terminals 10e to 10g of the first power supply unit 10A.

  The three-phase full-wave rectification bridge 12A is composed of six diodes D7 to D12. The anode of the diode D7 and the cathode of the diode D8 are connected in series, the anode of the diode D9 and the cathode of the diode D10 are connected in series, and the anode of the diode D11 and the cathode of the diode D12 are connected in series. Between the anode of the diode D7 and the cathode of the diode D8, between the anode of the diode D9 and the cathode of the diode D10, and between the anode of the diode D11 and the cathode of the diode D12, the secondary side of the low voltage transformer 11A. Each winding is connected.

  Furthermore, the cathodes of the diodes D7, D9, and D11 are connected in parallel to each other, and the anodes of the diodes D8, D10, and D12 are connected in parallel to each other. The cathodes of the diodes D7, D9, and D11 are connected to the output-side positive terminal 10c of the first power supply unit 10A, and the anodes of the diodes D8, D10, and D12 are connected to the output-side negative terminal 10d of the first power supply unit 10A. Has been.

  The first connection opening / closing parts 20C and 20D are formed by opening / closing switches. The first connection opening / closing part 20C is connected in series between the output-side positive terminal 10c of the first power supply part 10A and the positive terminal 31a of the second storage battery 31. On the other hand, the first connection opening / closing unit 20D is connected in series between the output-side negative terminal 10d of the first power supply unit 10A and the negative terminal 31b of the second storage battery 31. Similarly to the first storage battery 30, the second storage battery 31 is formed by connecting a plurality of storage battery cells in series.

  The second connection opening / closing unit 50 </ b> C is connected in series between the output-side positive terminal 40 c of the second power supply unit 40 and the negative terminal 31 b of the second storage battery 31. On the other hand, the second connection opening / closing part 50D is connected in series between the positive electrode terminal 31a of the second storage battery 31 and the load connection positive electrode terminal 1a of the power supply device 1A. The output-side negative terminal 40d of the second power supply unit 40 is connected in series to the load connection negative terminal 1b of the power supply device 1A. A smoothing capacitor C4 and a load 60 are connected in parallel between the load connection positive terminal 1a and the load connection negative terminal 1b. The smoothing capacitor C4 is used to reduce a voltage difference that occurs at the time of switching discharge between the first storage battery 30 and the second storage battery 31.

  Next, the operation of the power supply device 1A (during output load) will be described. In the power supply device 1A, the first charging / discharging operation for supplying a direct current from the first storage battery 30 and the second power supply unit 40 to the load 60 after the charging of the first storage battery 30 is completed as follows. I do. When single-phase or multi-phase (for example, three-phase) AC power is supplied from the external power source to the input-side terminals 10e to 10g of the first power supply unit 10A, the AC voltage is stepped down by the low-voltage transformer 11A. Increase. Subsequently, the AC power supplied from the secondary side of the low-voltage transformer 11A is full-wave rectified by the three-phase full-wave rectification bridge 12A and then smoothed by the smoothing capacitor 13 to obtain low-voltage high-current DC power. Converted. DC power of low voltage and large current is supplied to the first storage battery 30 in a state where the first connection opening / closing sections 20A, 20B are closed and the second connection opening / closing sections 50A, 50B are opened. Thereby, the 1st storage battery 30 is charged. At this time, the first connection opening / closing parts 20C, 20D and the second connection opening / closing parts 50C, 50D are opened.

  After the charging of the first storage battery 30 by the first power supply unit 10A is completed, the first connection opening / closing units 20A, 20B are opened and the second connection opening / closing units 50A, 50B are closed, as in the first embodiment. High-voltage and large-current DC power is supplied to the first storage battery 30. As a result, the storage voltage (low voltage) of the first storage battery 30 and the DC voltage (high voltage) supplied from the second power supply unit 40 are combined inside the first storage battery 30, and the first The storage current (large current) of the storage battery 30 and the current (small current) supplied from the second power supply unit 40 are combined within the first storage battery 30 without being added together. The power supply device 1A supplies a direct current proportional to the load to the load 60.

  Further, in the present embodiment, alternating between the first charge / discharge operation and the second storage battery 31 and the second power supply unit 40 from the second storage battery 31 and the second power supply unit 40 after the charging of the second storage battery 31 is completed as follows. A second charge / discharge operation for supplying current is performed. Immediately after the charging of the first storage battery 30 is completed, the first connection opening / closing parts 20A, 20B are opened and the second connection opening / closing parts 50A, 50B are closed, the first connection opening / closing parts 20C, 20D are closed and the second connection is opened. DC power of low voltage and large current is supplied to the second storage battery 31 with the open / close sections 50C and 50D being opened. Thereby, the 2nd storage battery 31 is charged.

  Then, after the charging of the second storage battery 31 by the first power supply unit 10A is completed, the second power supply unit is opened in a state where the first connection open / close units 20C and 20D are opened and the second connection open / close units 50C and 50D are closed. 40, high-voltage and large-current DC power is supplied to the second storage battery 31. As a result, similarly to the first charging / discharging operation, the storage voltage (low voltage) of the second storage battery 31 and the DC voltage (high voltage) supplied from the second power supply unit 40 are internal to the second storage battery 31. In addition, the storage current (large current) of the second storage battery 31 and the current (small current) supplied from the second power supply unit 40 are combined without being added together in the second storage battery 31. The Then, similarly to the first charge / discharge operation, the power supply device 1 </ b> A supplies a direct current to the load 60.

  Subsequently, immediately after the charging of the second storage battery 31 is completed during the second charging / discharging operation, the first connection opening / closing parts 20C, 20D are opened, and the second connection opening / closing parts 50C, 50D are closed. The first storage battery 30 is charged with the parts 20A and 20B closed and the second connection opening and closing parts 50A and 50B opened. Following this, the first connection opening / closing sections 20A, 20B are opened and the second connection opening / closing sections 50A, 50B are closed to supply high-voltage, large-current DC power to the first storage battery 30 (first charging Discharge operation) can be performed. Therefore, in the power supply device 1A of the present embodiment, the first charge / discharge operation and the second charge / discharge operation can be alternately repeated.

<Effect of Embodiment 2>
In the power supply device 1A of the present embodiment, the first charging / discharging operation using the first storage battery 30 and the second charging / discharging operation using the second storage battery 31 are alternately performed, so that a high voltage can be obtained. It becomes possible to supply large current power to the load 60 without interruption.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. Here, the same configurations as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. As illustrated in FIG. 3, the power supply device 1 </ b> B includes first power supply units 10 </ b> B to 10 </ b> D, first connection opening / closing units 20 </ b> A to 20 </ b> D, a first storage battery 30, a second storage battery 31, and a second power supply unit. 40 and second connection opening / closing sections 50A to 50D. The first power supply units 10B to 10D are examples of the first DC power supply unit of the present invention.

  The first power supply units 10 </ b> B to 10 </ b> D each include a low-voltage transformer 11 and a single-phase full-wave rectification bridge 12, similar to the first power supply unit 10 of the first embodiment. The primary winding of the low voltage transformer 11 of the first power supply unit 10B is connected to the input side terminals 10h and 10i of the first power supply unit 10B. The secondary winding of the low voltage transformer 11 of the first power supply unit 10B is connected to the input terminals 12a and 12b of the single-phase full-wave rectification bridge 12. The output terminals 12c and 12d of the single-phase full-wave rectification bridge 12 are connected to the output-side positive terminal 10n and the output-side negative terminal 10o of the first power supply unit 10B. This output-side positive terminal 10n is connected to the anode of the rectifier diode D15.

  The primary side winding of the low voltage transformer 11 of the first power supply unit 10C is connected to the input side terminals 10j and 10k of the first power supply unit 10C. The secondary winding of the low voltage transformer 11 of the first power supply unit 10 </ b> C is connected to the input terminals 12 a and 12 b of the single-phase full-wave rectification bridge 12. The output terminals 12c and 12d of the single-phase full-wave rectification bridge 12 are connected to the output-side positive terminal 10p and the output-side negative terminal 10q of the first power supply unit 10C. The output side positive terminal 10p is connected to the anode of the rectifier diode D16.

  The primary winding of the low voltage transformer 11 of the first power supply unit 10D is connected to the input terminals 10l and 10m of the first power supply unit 10D. The secondary winding of the low voltage transformer 11 of the first power supply unit 10 </ b> D is connected to the input terminals 12 a and 12 b of the single-phase full-wave rectifier bridge 12. The output terminals 12c and 12d of the single-phase full-wave rectification bridge 12 are connected to the output-side positive terminal 10r and the output-side negative terminal 10s of the first power supply unit 10D. This output-side positive terminal 10r is connected to the anode of the rectifier diode D17.

  The cathodes of the rectifier diodes D15, D16, D17 are connected in parallel to each other and connected in parallel to the positive electrode terminal 30a of the first storage battery 30 via the first connection opening / closing part 20A. Further, the cathodes of the rectifier diodes D15, D16, D17 are connected in parallel to the positive electrode terminal 31a of the second storage battery 31 through the first connection opening / closing part 20C. As a result, the output side positive terminals 10n, 10p, and 10r of the first power supply units 10B to 10D are connected in parallel to each other.

  The output-side negative terminals 10o, 10q, and 10s are connected in parallel to each other and connected in parallel to the negative terminal 30b of the first storage battery 30 via the first connection opening / closing part 20B. Furthermore, the output-side negative terminals 10o, 10q, and 10s are connected in parallel to the negative terminal 31b of the second storage battery 31 via the first connection opening / closing part 20D. As a result, the output side negative terminals 10o, 10q, and 10s of the first power supply units 10B to 10D are connected in parallel to each other.

  In addition, the positive electrode of the smoothing capacitor 13A is connected between the output-side positive electrode terminal 10n and the anode of the rectifier diode D15, and the negative electrode of the smoothing capacitor 13A is connected between the output-side negative electrode terminal 10o and the first connection opening / closing parts 20B and 20D. Connected between. The positive electrode of the smoothing capacitor 13B is connected between the output-side positive electrode terminal 10p and the anode of the rectifier diode D16, and the negative electrode of the smoothing capacitor 13B is connected between the output-side negative electrode terminal 10q and the first connection opening / closing parts 20B and 20D. It is connected. The positive electrode of the smoothing capacitor 13C is connected between the output-side positive electrode terminal 10r and the anode of the rectifier diode D17, and the negative electrode of the smoothing capacitor 13C is connected between the output-side negative electrode terminal 10s and the first connection opening / closing parts 20B and 20D. It is connected.

  Next, the operation of the power supply device 1B (during output load) will be described. When single-phase AC power is supplied from the external power source to the input side terminals 10h to 10m of the first power supply units 10B to 10D, the AC voltage is stepped down by each low voltage transformer 11 to increase the AC current. Subsequently, the AC power supplied from the secondary side of each low-voltage transformer 11 is converted into DC power having a low voltage and a large current in the same manner as in the first embodiment. In addition, multi-phase (for example, three-phase) AC power is supplied to all the first power supply units 10B to 10D from an AC generator having an external power source and a plurality of (for example, three) stator coils through the input terminals 10h to 10m. Even in the case of being supplied, the multiphase AC power is converted into the DC power of low voltage and large current in the same manner as when the single phase AC power is supplied to the input side terminals 10h to 10m.

  In the present embodiment, the output side positive terminals 10n, 10p, and 10r of the first power supply units 10B to 10D are in a state where the first connection opening / closing units 20A and 20B are closed and the second connection opening / closing units 50A and 50B are opened. The output-side negative terminals 10o, 10q, and 10s can be connected to the positive terminal 30a of the first storage battery 30 and the negative terminal 30b of the first storage battery 30, respectively. In this state, low-voltage and large-current DC power can be supplied to the first storage battery 30. Further, immediately after the charging of the first storage battery 30 is completed by the DC power, the first connection opening / closing parts 20A, 20B are opened and the second connection opening / closing parts 50A, 50B are closed, the first connection opening / closing parts 20C, 20D. In the state where the second connection opening / closing sections 50C and 50D are opened, the output-side positive terminals 10n, 10p, and 10r of the first power supply sections 10B to 10D are connected to the positive terminal 31a of the second storage battery 31 on the output side. The negative terminals 10o, 10q, and 10s can be connected to the negative terminal 31b of the second storage battery 31, respectively. In this state, low-voltage and large-current DC power can be supplied to the second storage battery 31. Therefore, in the power supply device 1B of the present embodiment, the first connection opening / closing sections 20A, 20B and the first connection opening / closing sections 20C, 20D are alternately opened / closed so that each of the first power supply sections 10B-10D is the first storage battery. 30 and the second storage battery 31 can be alternately connected.

<Effect of Embodiment 3>
In the power supply device 1B of the present embodiment, in addition to supplying single-phase AC power to the input-side terminals 10h to 10m of the first power supply units 10B to 10D, the first power supply units 10B to 10B connected in parallel are connected. By supplying multiphase AC power to 10D through the input-side terminals 10h to 10m, the first power supply units 10B to 10D can generate DC power. Furthermore, since each 1st power supply part 10B-10D becomes connectable alternately with the 1st storage battery 30 and the 2nd storage battery 31, it is 1st by the direct-current power which 1st power supply part 10B-10D produced | generated. It becomes possible to charge the storage battery 30 and the second storage battery 31 alternately.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. Here, the same configurations as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted. In the power supply device 1C of the present embodiment, as shown in FIG. 4, the second power supply unit 40A includes a rectifying unit 42A, a smoothing unit 43A, and a direct current limiting unit 44. The second power supply unit 40A is an example of a third DC power supply unit of the present invention.

  The rectifying unit 42A is formed by a three-phase full-wave rectifying bridge, like the rectifying unit 42 of the first embodiment. The input terminal 40e of the second power supply unit 40A is connected in parallel between the anode of the diode D1 and the cathode of the diode D2, and the input terminal 40f of the second power supply unit 40A is connected to the anode of the diode D3 and the diode D4. The input terminal 40g of the second power supply unit 40A is connected in parallel between the anode of the diode D5 and the cathode of the diode D6. The cathodes of the diodes D1, D3, and D5 are connected to the output-side positive terminal 42c of the rectifying unit 42A, and the anodes of the diodes D2, D4, and D6 are connected to the output-side negative terminal 42d of the rectifying unit 42A.

  The smoothing unit 43A is formed by a smoothing circuit in which a reactor L11 is connected between two capacitors C11 and C12 connected in parallel. The positive electrode of the capacitor C11 is connected to the output-side positive terminal 42c of the rectifier 42A, and the negative electrode of the capacitor C11 is connected to the output-side negative terminal 42d.

  The direct current limiting unit 44 includes a PNP transistor TR 1 and a control device 45. The emitter of the PNP transistor TR1 is connected to the positive electrode of the capacitor C12 of the smoothing unit 43A. The base of the PNP transistor TR1 is connected to the control signal output terminal 45a of the control device 45. When the power of the power supply device 1C is turned on, the control device 45 outputs a high level signal that limits the direct current passing through the PNP transistor TR1 within a predetermined value from the control signal output terminal 45a. Furthermore, the output-side positive terminal 40c of the second power supply unit 40A is connected to the collector of the PNP transistor TR1, and the output-side negative terminal 40d is connected to the negative electrode of the capacitor C12 of the smoothing unit 43A.

  Next, the operation of the second power supply unit 40A (at the time of output load) will be described. When single-phase or multi-phase (for example, three-phase) AC power is supplied from the external power source to the input-side terminals 40e to 40g of the second power source unit 40A, the AC power is full-wave rectified by the rectifier unit 42A. . Thereafter, the smoothing unit 43A generates direct-current power by smoothing the power of the pulsating current waveform that has been full-wave rectified. Following this, the PNP transistor TR1, which is turned on by the high level signal from the control device 45, limits the direct current output from the smoothing unit 43A to a small current within a predetermined value and outputs it to the output positive terminal 40c. To do. As a result, the second power supply unit 40A can supply high-voltage and small-current DC power from the output-side positive terminal 40c and the output-side negative terminal 40d. The high level signal is an example of the output control signal of the present invention.

<Effect of Embodiment 4>
In the power supply device 1 </ b> C of the present embodiment, the conduction state of the PNP transistor TR <b> 1 of the direct current limiting unit 44 can be adjusted by controlling the conduction state by a high level signal output from the control device 45. become. Therefore, it becomes easy to adjust the current value of the small current output from the DC current limiting unit 44 by the high level signal.

<Embodiment 5>
Embodiment 5 of the present invention will be described with reference to FIG. Here, the same configurations as those in the first to fourth embodiments are denoted by the same reference numerals, and the description thereof is omitted. In the power supply device 1D of the present embodiment, as shown in FIG. 5, the second power supply unit 40B includes a three-phase full-wave rectification bridge, PNP transistors TR2 to TR4 that function as a direct current limiting unit, a control device 45A, And a smoothing portion 43B. The second power supply unit 40B is an example of a fourth DC power supply unit of the present invention.

  The three-phase full-wave rectification bridge is composed of six diodes D21 to D26. In the three-phase full-wave rectification bridge, PNP transistors TR2 to TR4 are combined. The collector of the PNP transistor TR2 is connected in series to the anode of the diode D21, and the emitter of the PNP transistor TR2 is connected to the cathode of the diode D22.

  The collector of the PNP transistor TR3 is connected in series to the anode of the diode D23, and the emitter of the PNP transistor TR3 is connected to the cathode of the diode D24. The collector of the PNP transistor TR4 is connected in series to the anode A of the diode D25, and the emitter of the PNP transistor TR4 is connected to the cathode K of the diode D26.

  Further, the cathodes of the diodes D21, D23, D25 corresponding to the output side of the three-phase full-wave rectification bridge are connected in parallel to each other, and the anodes of the diodes D22, D24, D26 are connected in parallel to each other. On the other hand, between the emitter of the PNP transistor TR2 corresponding to the input side of the three-phase full-wave rectification bridge and the cathode of the diode D22 is connected to the input side terminal 40h of the second power supply unit 40B. Between the emitter of the PNP transistor TR3 corresponding to the input side of the three-phase full-wave rectifier bridge and the cathode of the diode D24 is connected to the input side terminal 40i of the second power supply section 40B. Between the emitter of the PNP transistor TR4 corresponding to the input side of the three-phase full-wave rectification bridge and the cathode K of the diode D26 is connected to the input side terminal 40j of the second power supply section 40B. In the three-phase full-wave rectifier bridge of the present embodiment, the diodes D21, D23, D25 are located between the input side and the output side of the three-phase full-wave rectifier bridge, and the PNP transistors TR2 to TR5 are the diode D21 on the input side. , D23 and D25 are connected in series. The three-phase full-wave rectification bridge of this embodiment is an example of the rectification bridge of the present invention, and the diodes D21, D23, and D25 are examples of the rectification element of the present invention.

  In addition, the base of the PNP transistor TR2 is connected to the control signal output terminal 45b of the control device 45A, and the base of the PNP transistor TR3 is connected to the control signal output terminal 45c of the control device 45A. In addition, the base of the PNP transistor TR4 is connected to the control signal output terminal 45d of the control device 45A. When the power supply device 1D is turned on, the control device 45A outputs from the control signal output terminals 45b to 45d high level signals that limit the pulsating direct current passing through the PNP transistors TR2 to TR4 within a predetermined value. .

  The smoothing unit 43B is formed by a smoothing circuit in which a reactor L21 is connected between two capacitors C21 and C22 connected in parallel. The positive electrode of the capacitor C21 is connected to the cathodes of the diodes D21, D23, and D25, and the negative electrode of the capacitor C21 is connected to the anodes of the diodes D22, D24, and D26. The positive electrode of the capacitor C22 is connected to the output-side positive terminal 40c of the second power supply unit 40B, and the negative electrode of the capacitor C22 is connected to the output-side negative terminal 40d of the second power supply unit 40B.

  Next, the operation of the second power supply unit 40B (at the time of output load) will be described. As in the fourth embodiment, the PNP transistors TR2 to TR4 are turned on by a high level signal from the control device 45A. When single-phase or multi-phase (for example, three-phase) AC power is supplied from an external power source to the three-phase full-wave rectification bridge through the input-side terminals 40h to 40j of the second power supply unit 40B in this state, each PNP transistor TR2 to TR4 exhibit a rectifying action to convert an alternating current supplied from an external power source into a pulsating direct current limited to a predetermined value and pass it. At the same time, the three-phase full-wave rectification bridge performs full-wave rectification on the AC power supplied from the external power source.

  Subsequently, the smoothing unit 43B smoothes the power of the pulsating waveform after full-wave rectification output from the three-phase full-wave rectification bridge to generate a DC output. Thereafter, the smoothing unit 43B outputs a small current whose current value is limited to the above predetermined value to the output-side positive terminal 40c. As a result, the second power supply unit 40B can supply high-voltage and small-current DC power from the output-side positive terminal 40c and the output-side negative terminal 40d.

<Effect of Embodiment 5>
The second power supply unit 40B included in the power supply device 1D of the present embodiment converts the alternating current supplied from the external power supply into a pulsating direct current limited to a predetermined value and restricts the passage of the pulsating direct current. By combining the PNP transistors TR2 to TR4 in the three-phase full-wave rectification bridge, the amount of passing current of the pulsating DC current is adjusted in the three-phase full-wave rectification bridge, and the AC power supplied from the external power source Both full-wave rectification can be performed.

<Embodiment 6>
Embodiment 6 of the present invention will be described with reference to FIG. Here, the same components as those in the first to fifth embodiments are denoted by the same reference numerals, and the description thereof is omitted. In the power supply device 1E of the present embodiment, as shown in FIG. 6, the second power supply unit 40C includes a direct current limiting unit 44B and a control device 45B. The second power supply unit 40C is an example of a fifth DC power supply unit of the present invention.

  The direct current limiter 44B is formed by a PNP transistor TR5. The emitter of the PNP transistor TR5 is connected to the input-side positive terminal 40k of the second power supply unit 40C. The base of the PNP transistor TR5 is connected to the control signal output terminal 45g of the control device 45B. When the power supply 1E is turned on, the control device 45B outputs a high level signal that limits the direct current passing through the PNP transistor TR5 within a predetermined value from the control signal output terminal 45g. Furthermore, the output-side positive terminal 40c of the second power supply unit 40C is connected to the collector of the PNP transistor TR5, and the output-side negative terminal 40d of the second power supply unit 40C is the input-side negative terminal of the second power supply unit 40C. 40 l.

  Next, the operation of the second power supply unit 40C (at the time of output load) will be described. DC power is supplied from a DC power source (for example, a DC generator or a storage battery) as an external power source to the input-side positive terminal 40k and the input-side negative terminal 40l of the second power supply unit 40C. Thereafter, the PNP transistor TR5, which is turned on by the high level signal from the control device 45B, limits the direct current supplied from the direct current power source to a small current within a predetermined value and outputs it to the output-side positive terminal 40c. As a result, the second power supply unit 40C can supply high-voltage, small-current DC power from the output-side positive terminal 40c and the output-side negative terminal 40d.

<Effect of Embodiment 6>
In the power supply device 1E of the present embodiment, the direct current supplied from the direct current power supply is reduced to a small current with a reduced current value by the direct current limiter 44B capable of controlling the conduction state of the PNP transistor TR5 that outputs direct current. It becomes possible to convert. Therefore, the DC current limiting unit 44B can convert the DC current supplied from the DC power source into a small current with a simple configuration using the DC current limiting unit 44B formed by the PNP transistor TR5.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. For example, the AC voltage, AC current, frequency and phase supplied from the external power supply to the first power supply unit 10, 10A, 10B are the AC voltage supplied from the external power supply to the second power supply unit 40, 40A, 40B, It does not have to coincide with the alternating current, frequency and phase. The smoothing unit 43 (Embodiment 1), the smoothing unit 43A (Embodiment 4), and the smoothing unit 43B (Embodiment 5) may be formed by a smoothing circuit using diodes instead of the reactors L1, L11, and L21. Good. Further, each of the smoothing parts 43, 43A, 43B may be formed with one capacitor (C1, C11, C21) instead of two.

  Further, when a tandem type AC generator or two AC generators are used as an external power source, the first power supply unit 10, 10A from the low voltage generation unit of the tandem type AC generator or the first AC generator, AC power may be supplied to 10B, and AC power may be supplied to the second power supply units 40, 40A, and 40B from the high-voltage generator of the tandem AC generator or the second AC generator. In addition, an inverter, a servo motor, or the like that converts direct current to alternating current between the load connection positive terminal 1a, the load connection negative terminal 1b of each of the power supply devices 1, 1A, and 1B of the first to third embodiments and an AC drive load A servo amplifier for controlling the load may be provided.

  Further, the diodes D1 to D6 (embodiments 1 and 4) of the rectifiers 42 and 42A, the diodes D7 to D12 (embodiment 2) of the three-phase full-wave rectifier bridge 12A, the rectifier diodes D15 to D17 (embodiment 3), and the three-phase The diodes D21 to D26 (Embodiment 5) of the full-wave rectifier bridge may be replaced with a selenium rectifier or a thyristor. Furthermore, the first power supply unit 10 (Embodiment 1), the first power supply unit 10A (Embodiment 2), and the first power supply unit 10B (Embodiment 3) are not provided with the low voltage transformers 11 and 11A. A single-phase full-wave rectification bridge 12 or a three-phase full-wave rectification bridge 12A may perform full-wave rectification of the alternating-current power by supplying low-voltage and large-current AC power from an external power source. In addition, when an appropriate low voltage and large current DC power can be supplied in advance to each power supply device 1, 1 </ b> A to 1 </ b> E by an external power supply, each power supply device 1, 1 </ b> A to 1 </ b> E includes the first power supply unit 10. 10A and 10B may not be provided.

  The first connection opening / closing sections 20A and 20C (Embodiments 1 to 3) are not limited to the opening / closing switches, and may be formed of diodes or the like or thyristors that exhibit a rectifying action. Further, the first connection opening / closing sections 20A to 20D (Embodiments 1 to 3) and the second connection opening / closing sections 50A to 50D (Embodiments 1 to 3) are contactless switches and electromagnetics represented by semiconductor switches such as thyristors and transistors. You may form with the contact switch represented by the switch. In addition, the DC current limiting portions 44 and 44B and the like in the power supply devices 1C to 1F (Embodiments 4 to 6) may be formed by replacing the PNP transistors TR1 to TR5 with field effect transistors or thyristors.

  In addition, a boost circuit such as a boost chopper may be provided between the load connection positive terminal 1 a and the load connection negative terminal 1 b of each of the power supply devices 1, 1 </ b> A, and 1 </ b> B of the first to third embodiments. Further, in the second embodiment, the two storage batteries 30 and 31 can alternately supply the direct current to the load 60. However, three or more storage batteries may alternately supply the direct current to the load 60. In addition, each power supply device 1, 1 </ b> A to 1 </ b> D is not limited to being supplied with three-phase AC power from an external power supply, and for example, AC power is supplied to each stator coil from an AC generator having six stator coils. You may be made to do. The AC current limiting unit 41 (Embodiment 1) is not limited to an AC reactor for limiting current, but may be formed of an AC current limiting circuit other than this. Furthermore, the second power supply unit 40 in the power supply devices 1, 1 </ b> A, and 1 </ b> B may be replaced with a DC generator that can supply high-voltage and small-current power.

  1, 1A to 1E... Power supply device, 10, 10A to 10D... First power supply unit, 20A to 20D... First connection opening and closing unit, 30... First storage battery, 31. 40, 40A to 40C ··· second power supply unit, 41 ·· AC current limiting unit, 42, 42A · · rectifying unit, 43, 43A, 43B · · smoothing unit, 44, 44B · · DC current limiting unit , 50A to 50D, second connection opening / closing section, 60, load, D21 to D26, diode, TR2, TR4, PNP transistor.

Claims (7)

A power supply device provided with a storage battery capable of supplying power to a load,
A first power supply unit capable of supplying a large current with a low voltage to the storage battery;
A second power supply unit capable of supplying the storage battery with a high voltage having a higher potential than the first power supply unit and a small current having a smaller current value than the first power supply unit;
A first connection opening / closing section capable of connecting the first power supply section to the storage battery;
A second connection opening / closing part capable of connecting the second power supply unit and the load to the storage battery and capable of alternately opening and closing the first connection opening / closing part;
By closing the first connection opening / closing part and opening the second connection opening / closing part, the charging of the storage battery is completed by the power from the first power supply part, and then the first connection opening / closing part is opened. A power supply device that supplies power to the load from the storage battery and the second power supply unit by closing the second connection opening / closing unit. Two or more storage batteries,
The first connection opening / closing part is connected to one first connection opening / closing part capable of connecting one storage battery and the first power supply part, and another first connection opening / closing part capable of connecting another storage battery and the first power supply part. 1 connection opening and closing part, the one first connection opening and closing part and the other first connection opening and closing part is provided to be able to open and close alternately,
The second connection opening / closing unit includes one second connection opening / closing unit capable of connecting the second power supply unit and the load to the one storage battery, and the second power supply unit to the other storage battery. The second connection opening / closing part that can be connected to the load, and the one second connection opening / closing part and the other second connection opening / closing part are provided to be alternately openable and closable.
By closing the one first connection opening / closing part and opening the one second connection opening / closing part, after the charging of the one storage battery is completed by the electric power from the first power supply part, the one first connection opening / closing part is opened. A first charging / discharging operation for supplying power to the load from the one storage battery and the second power supply unit by opening one connection opening / closing unit and closing the one second connection opening / closing unit;
By closing the other first connection opening / closing part and opening the other second connection opening / closing part, the charging of the other storage battery is completed by the electric power from the first power supply part, and then the other second connection opening / closing part is opened. A second charging / discharging operation for supplying power to the load from the other storage battery and the second power supply unit by opening one connection opening / closing unit and closing the other second connection opening / closing unit; The power supply apparatus according to claim 1, wherein the power supply apparatus is alternately performed. The first power supply unit is formed by connecting a plurality of first DC power supply units that input a single-phase AC power as an external power supply and generate the large current DC power at the low voltage,
The plurality of first DC power supply units can be alternately connected to the one storage battery and the other storage battery by the one first connection opening / closing part and the other first connection opening / closing part. The power supply device according to claim 2. The second power supply unit is formed by a second DC power supply unit that inputs single-phase AC power or multiphase AC power as an external power source and generates the small current DC power at the high voltage,
The second DC power supply unit is
An AC current limiter that limits the AC current supplied from the external power source to the current value of the small current;
A rectifying unit that rectifies the output of the alternating current limiting unit;
A smoothing unit for smoothing the output of the rectifying unit and outputting the small current of DC;
The power supply device according to claim 1, further comprising: The second power source unit is formed by a third DC power source unit that inputs single-phase AC power or multi-phase AC power as an external power source and generates the small current DC power at the high voltage,
The third DC power supply unit is
A rectifying unit for rectifying the input AC power;
A smoothing unit for smoothing the output of the rectifying unit and outputting a direct current;
A direct current limiting unit that outputs a small current by controlling a conduction state according to an output control signal and limiting the passage of the direct current output by the smoothing unit;
The power supply device according to claim 1, further comprising: The second power source unit is formed by a fourth DC power source unit that inputs single-phase AC power or multi-phase AC power as an external power source and generates the small current DC power at the high voltage,
The fourth DC power supply unit is
A rectifier bridge that full-wave rectifies each of the single-phase or multi-phase AC power,
In the rectifier bridge, AC connected to the rectifier element positioned between the input side and the output side in series on the input side and controlled in conduction according to the output control signal and supplied by the external power source A direct current limiting unit that converts the current into a pulsating direct current and restricts the passage of the pulsating direct current; and
The power supply device according to claim 1, further comprising: a smoothing unit that smoothes an output of the DC current limiting unit and outputs the small current. The second power source unit is formed by a fifth DC power source unit that inputs DC power as an external power source and generates the small current DC power at the high voltage,
The fifth DC power supply unit includes a DC current limiting unit that controls conduction by an output control signal, limits the passage of a DC current supplied from the external power supply, and outputs the small current. The power supply device according to any one of claims 1 to 3.

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