Wiring boxes, power backup systems and switching circuits

Abstract

To provide a power backup system that can realize power backup using a portable power supply device.SOLUTION: A power backup system 10 includes a portable power supply device 20 and a switching circuit unit 51 which electrically connects the portable power supply device 20 with a load during power outage and electrically connects a leakage current protection circuit to a first circuit that includes the portable power supply device 20 and the load.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a power backup system and a power backup method. [Background technology]

[0002] Patent Document 1 discloses a power supply system that can reduce stress on a switching device and a load when commercial power is restored, even if the load is an inductive load or a capacitive load. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-131423 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a power backup system and a power backup method that can realize power backup using a portable power supply device. [Means for solving the problem]

[0005] A power backup system according to one embodiment of the present invention comprises a portable power supply device and a switching circuit that electrically connects the portable power supply device to a load during a power outage and electrically connects a leakage current prevention circuit to a first circuit including the portable power supply device and the load.

[0006] A power backup method according to one embodiment of the present invention is a power backup method executed by a computer, and includes a switching step of electrically connecting a portable power supply device to a load during a power outage, and electrically connecting a leakage current prevention circuit to a first circuit including the portable power supply device and the load. [Effects of the Invention]

[0007] The power backup system and power backup method of the present invention can realize power backup using a portable power supply device. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a power backup system according to an embodiment. [Figure 2] FIG. 2 is a diagram showing an example of use of the portable power supply device according to the embodiment. [Figure 3] FIG. 3 is a diagram illustrating an example of use of the battery pack according to the embodiment. [Figure 4] FIG. 4 is a block diagram showing the functional configuration of a portable power supply device according to an embodiment. [Figure 5A] FIG. 5A is a diagram illustrating the components of a portable power supply used in pass-through mode. [Figure 5B] FIG. 5B is a diagram illustrating the components of a portable power supply used in charging mode. [Figure 5C] FIG. 5C is a diagram illustrating the components of a portable power supply used in discharge mode. [Figure 5D] FIG. 5D is a diagram illustrating the components of a portable power supply used in charge+pass-through mode. [Figure 6] FIG. 6 is a diagram illustrating a first configuration example of a distribution board and a wiring box. [Figure 7] FIG. 7 is a diagram illustrating a schematic configuration of a switching circuit unit according to Configuration Example 1. [Figure 8] FIG. 8 is a diagram illustrating a detailed configuration of the switching circuit unit according to the first configuration example. [Figure 9] FIG. 9 is a diagram illustrating a second configuration example of a distribution board and a wiring box. [Figure 10] FIG. 10 is a diagram illustrating a schematic configuration of a switching circuit unit according to Configuration Example 2. [Figure 11]FIG. 11 is a diagram illustrating a detailed configuration of the switching circuit unit according to the second configuration example. [Figure 12] FIG. 12 is an external view of a power backup system according to the first modification. [Figure 13] FIG. 13 is an external view of a power backup system according to the second modification. [Figure 14] FIG. 14 is an external view of a power backup system according to the third modification. [Figure 15] FIG. 15 is a diagram showing the internal configuration of a distribution board according to the third modification. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0010] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0011] (Embodiment) [Overall configuration] First, the configuration of a power backup system according to an embodiment will be described. Fig. 1 is a diagram showing a schematic configuration of a power backup system according to an embodiment.

[0012] 1 is a system that can supply power to loads such as lighting fixtures connected to a distribution board 40 during a power outage using a storage battery pack 21 and a charge / discharge device 22. A power outage here refers to, for example, a state in which the power supply from a power grid to the distribution board 40 is cut off. The power backup system 10 includes a portable power supply device 20, a stand 30, a distribution board 40, a wiring box 50, an electric cord CA, and an electric cord CB.

[0013] [Portable power supply configuration example] First, a description will be given of the portable power supply device 20 and its stand 30. The portable power supply device 20 comprises a storage battery pack 21 and a charge / discharge device 22. Figure 2 is a diagram showing an example of how the portable power supply device 20 is used.

[0014] As shown in FIG. 2, portable power supply device 20 (charging / discharging device 22 with storage battery pack 21 connected) can output AC power using DC power stored in storage battery pack 21. Charging / discharging device 22 of portable power supply device 20 has an output unit OB, and can output AC power from output unit OB. Note that output unit OB is, for example, an AC outlet. In this way, portable power supply 20 can function as a power source for a load (an electric fan in the example of FIG. 2) connected to output unit OB.

[0015] The storage battery pack 21 detached from the charging / discharging device 22 can also be used as a standalone portable power supply. FIG. 3 is a diagram showing an example of how the storage battery pack 21 is used. As shown in FIG. 3, the storage battery pack 21 includes an output unit OC, and can output DC power from the output unit OC. The output unit OC is, for example, a USB connector, and although an input unit IC of a load (a mobile terminal in the example of FIG. 3) is connected to the output unit OC via an electrical cord CC in FIG. 3, the load may also be connected directly to the output unit OC. In this way, the storage battery pack 21 can function as a standalone portable power supply.

[0016] The specific configuration of portable power supply device 20 will be described below with reference to Fig. 4 in addition to Fig. 1. Fig. 4 is a block diagram showing the functional configuration of portable power supply device 20.

[0017] The battery pack 21 of the portable power supply device 20 is detachably connected to the charge / discharge device 22. The battery pack 21 is realized by a secondary battery that can be repeatedly charged and discharged. The battery pack 21 is realized by, for example, a lithium-ion battery.

[0018] The charging / discharging device 22 of the portable power supply device 20 functions as a charger that charges the storage battery pack 21 using AC power obtained from an input unit IA. The charging / discharging device 22 also functions as a discharger that outputs (discharges) AC power from an output unit OB using the power stored in the storage battery pack 21. Specifically, the charging / discharging device 22 includes an input unit IA, an output unit OB, a charging circuit 23, a discharging circuit 24, a control unit 25, and a selector switch 26. The charging / discharging device 22 is placed on a stand 30 when in use.

[0019] The input unit IA is a terminal through which the charging / discharging device 22 obtains AC power. In the power backup system 10, for example, a connection portion (the end opposite to the plug portion) of an electric cord CA is connected to the input unit IA. In the power backup system 10, the plug portion of the electric cord CA is connected to an output unit OA (outlet) that is connected to a branch circuit branched off from the distribution board 40.

[0020] The output unit OB is a terminal through which the charging / discharging device 22 outputs AC power. In the power backup system 10, for example, a plug portion of an electric cord CB is connected to the output unit OB. In the power backup system 10, the connection portion of the electric cord CB (the end opposite the plug portion) is connected to an input unit IB provided in a distribution box. The AC power output from the output unit OB has the same amplitude and frequency as the AC power input to the input unit IA.

[0021] The charging circuit 23 is a circuit for acquiring AC power input to the input unit IA and converting the acquired AC power into DC power suitable for charging the storage battery pack 21. The charging circuit 23 is realized by, for example, an AC (Alternating Current)-DC (Direct Current) converter circuit or the like.

[0022] The discharge circuit 24 is a circuit for acquiring DC power stored in the battery pack 21 and converting the acquired DC power into AC power. The discharge circuit 24 is realized by, for example, a DC-AC inverter circuit. The AC power obtained by the conversion is output from an output unit OB.

[0023] The control unit 25 controls at least one of the charging circuit 23 and the discharging circuit 24 based on the state of the selector switch 26. The control unit 25 is realized by, for example, a microcomputer, and the functions of the control unit 25 are realized by, for example, an internal processor executing a computer program stored in an internal memory.

[0024] The selector switch 26 is a hardware switch that the user operates to switch (in other words, select) the operating mode of the portable power supply 20. The portable power supply 20 has four operating modes: pass-through mode, charge mode, discharge mode, and charge + pass-through mode.

[0025] The pass-through mode is an operating mode in which AC power input to input section IA is output directly to output section OB. Figure 5A is a diagram showing the components of portable power supply device 20 used in pass-through mode.

[0026] The charging mode is an operating mode in which the storage battery pack 21 is charged using AC power input to the input unit IA. FIG. 5B is a diagram showing the components of the portable power supply device 20 used in the charging mode. Specifically, the control unit 25 controls the charging circuit 23 to charge the storage battery pack 21 using the AC power input to the input unit IA. Note that in the charging mode, AC power is not output from the output unit OB.

[0027] The discharge mode is an operating mode in which AC power is output (discharged) from output unit OB using DC power stored in storage battery pack 21. Figure 5C is a diagram showing the components of portable power supply device 20 used in the discharge mode. Specifically, control unit 25 controls discharge circuit 24 to output AC power from output unit OB using DC power.

[0028] The charge + pass-through mode is an operating mode in which AC power is output (discharged) from output unit OB using DC power stored in storage battery pack 21. Fig. 5D is a diagram showing the components of portable power supply device 20 used in the charge + pass-through mode.

[0029] The control unit 25 has a function of automatically transitioning to the discharge mode when AC power to the input unit IA is interrupted (for example, when a power outage occurs) while operating in the pass-through mode or the charge+pass-through mode (hereinafter also referred to as the pass-through mode, etc.). That is, when the control unit 25 detects a power outage while operating in the pass-through mode, etc., it has a function of automatically transitioning to the discharge mode in response to this. Furthermore, it also has a function of automatically transitioning to the pass-through mode, etc., when input of AC power to the input unit IA begins while operating in the discharge mode. These functions may be defined as an operation mode (such as a backup mode) separate from the above four operation modes, and may be switchable by the selector switch 26.

[0030] [Configuration example 1 of distribution board and wiring box] Next, there are two possible configuration examples for the distribution board 40 and the wiring box 50. Of the two configuration examples, configuration example 1 will be described below with reference to Fig. 1 and Fig. 6. Fig. 6 is a diagram showing configuration example 1 of the distribution board 40 and the wiring box 50.

[0031] The distribution board 40 distributes AC power supplied from the system power supply 70 within the facility in which the distribution board 40 is installed. Specifically, the distribution board 40 includes a main breaker 41 and a plurality of branch breakers 42.

[0032] The main breaker 41 is a circuit breaker for turning on and off AC power supplied from the system power supply 70. A circuit corresponding to the main breaker is called a main circuit or the like.

[0033] The branch breaker 42 is a circuit breaker for turning on and off AC power supplied to the branch circuit corresponding to the branch breaker 42. A branch circuit is provided, for example, for each room (living room, dining room, bedroom, etc.) in the facility, and an output unit OA is connected to the branch circuit. A user can operate a load (a plug for an electrical device) in the facility by connecting the load to the output unit OA (outlet).

[0034] The distribution box 50 is electrically connected to the main circuit of the distribution board 40 by a power line. In other words, AC power supplied to the main circuit is distributed to branch circuits connected to the distribution board and circuits connected to the distribution box 50. Hereinafter, the load at the end of the circuit connected to the distribution box 50 will also be referred to as the target load. The distribution box 50 includes an input unit IB and a switching circuit unit 51.

[0035] A connector of the electric cord CB is connected to the input portion IB. As described above, the plug portion of the electric cord CB is connected to the output portion OB of the charging / discharging device 22. In other words, AC power can be input to the input portion IB from the portable power supply device 20.

[0036] During normal operation (non-power outage) when AC power is being input from distribution board 40 to wiring box 50, switching circuit unit 51 supplies the AC power to the target load, and during a power outage when the AC power from distribution board 40 to wiring box 50 is stopped, switching circuit unit 51 supplies AC power from portable power supply device 20 input to input section IB to the target load. Figure 7 is a diagram showing a schematic configuration of switching circuit unit 51, and Figure 8 is a diagram showing a detailed configuration of switching circuit unit 51.

[0037] 7 and 8, the switching circuit unit 51 includes a leakage current protection circuit 52 and a switching circuit 53. As the leakage current protection circuit 52, a leakage current protection circuit used in the main breaker 41 or the like is used.

[0038] Under normal circumstances, switching circuit 53 electrically connects distribution board 40 and the target load, disconnects leakage current protection circuit 52 from the circuit including distribution board 40 and the target load (in other words, the electrical path between distribution board 40 and the target load; hereinafter also referred to as the second circuit), and supplies AC power from distribution board 40 to the target load. In addition, during a power outage, switching circuit 53 electrically connects portable power supply 20 and the target load in place of distribution board 40, electrically connects leakage current protection circuit 52 to the circuit including portable power supply 20 and the target load (in other words, the circuit between portable power supply 20 and the target load; hereinafter also referred to as the first circuit), and supplies AC power from portable power supply 20 to the target load. Switching circuit 53 specifically includes a first relay circuit 54 and a second relay circuit 55.

[0039] The first relay circuit 54 includes a coil 54a, a switch unit 54b, and a switch unit 54c. The first relay circuit 54 turns off the switch units 54b and 54c when an AC current flows through the coil 54a (i.e., during normal operation when AC power is being input from the distribution board 40 to the distribution box 50). The first relay circuit 54 also turns on the switch units 54b and 54c when no AC current flows through the coil 54a (i.e., during a power outage when AC power is not being input from the distribution board 40 to the distribution box 50).

[0040] The second relay circuit 55 includes a coil 55a, a switch unit 55b, and a switch unit 55c. When an AC current flows through the coil 55a (normal operation), the second relay circuit 55 electrically connects a target load to contacts A of the switch units 55b and 55c. When no AC current flows through the coil 55a (during a power outage), the second relay circuit 55 electrically connects the target load to contacts B of the switch units 55b and 55c.

[0041] In this way, during a power outage, the switching circuit 53 electrically connects the portable power supply device 20 to the target load, and electrically connects the leakage current prevention circuit 52 to the first circuit including the portable power supply device 20 and the target load, thereby enabling AC power to be supplied from the portable power supply device 20 to the target load.

[0042] The power backup system 10 includes not only the portable power supply 20 but also a switching circuit unit 51. Through the operation of the switching circuit unit 51 described above, during a power outage, the power backup system 10 can supply AC power from the portable power supply 20, which has transitioned from a pass-through mode or the like to a discharge mode, to the target load with the leakage current protection circuit 52 connected. In other words, the power backup system 10 can achieve AC power backup using the portable power supply 20.

[0043] The reason why the switching circuit unit 51 normally disconnects the leakage current protection circuit 52 from the target load is to prevent the leakage current protection circuit provided in the main breaker 41 and the leakage current protection circuit 52 from overlapping with the same branch circuit (target load), causing the leakage current protection circuit or the leakage current protection circuit 52 to not function properly.

[0044] [Configuration example 2 of distribution board and wiring box] Next, a second configuration example of the distribution board 40 and the wiring box 50 will be described with reference to Fig. 9 in addition to Fig. 1. Fig. 9 is a diagram showing a second configuration example of the distribution board 40 and the wiring box 50. Note that the following description of the second configuration example will mainly focus on the differences from the first configuration example, and will omit matters already mentioned in the first configuration example.

[0045] In configuration example 2, the distribution board 40 is connected to the wiring box 50 by a signal line instead of a power line. The distribution board 40 outputs a notification signal indicating whether a power outage or normal operation is occurring to the wiring box 50 via this signal line. The other configurations of the distribution board 40 in configuration example 2 are the same as those in configuration example 1.

[0046] The distribution box 50 in the configuration example 2 is electrically connected to the distribution board 40 by a signal line. The distribution box 50 includes an input unit IB and a switching circuit unit 56.

[0047] A connector of the electric cord CB is connected to the input portion IB. As described above, the plug portion of the electric cord CB is connected to the output portion OB of the charging / discharging device 22. In other words, AC power can be input to the input portion IB from the portable power supply device 20.

[0048] The switching circuit unit 56 in configuration example 2 disconnects the leakage current protection circuit 52 from the target load when the notification signal from the distribution board 40 indicates normal operation, and connects the leakage current protection circuit 52 to the target load when the notification signal from the distribution board 40 indicates a power outage. Fig. 10 is a diagram showing a schematic configuration of the switching circuit unit 56, and Fig. 11 is a diagram showing a detailed configuration of the switching circuit unit 56.

[0049] 10 and 11, the switching circuit unit 56 includes a leakage current protection circuit 52 and a switching circuit 57. As the leakage current protection circuit 52, a leakage current protection circuit used in the main breaker 41 or the like is used.

[0050] Switching circuit 57 electrically connects portable power supply 20 to the target load both during normal operation and during a power outage, and supplies AC power to the target load from portable power supply 20. As described above, portable power supply 20 has the function of automatically switching from pass-through mode or the like to discharge mode during a power outage, so that AC power continues to be supplied to the target load even during a power outage.

[0051] Here, switching circuit 57 normally disconnects leakage current protection circuit 52 from a first circuit including portable power supply 20 and the target load, and electrically connects leakage current protection circuit 52 to the first circuit during a power outage. Switching circuit 57 specifically includes first relay circuit 58 and second relay circuit 59.

[0052] First relay circuit 58 includes coil 58a, switch unit 58b, and switch unit 58c. When a notification signal indicating a normal state is input to coil 58a (normal state), first relay circuit 58 connects input unit IB (charging / discharging device 22) to contacts A of switch unit 58b and switch unit 58c. Furthermore, when a notification signal indicating a power outage is input to coil 58a (power outage), first relay circuit 58 connects input unit IB (charging / discharging device 22) to contacts B of switch unit 58b and switch unit 58c.

[0053] Second relay circuit 59 includes coil 59a, switch unit 59b, and switch unit 59c. When a notification signal indicating a normal state is input to coil 59a (normal state), second relay circuit 59 connects the target load to contacts A of switch unit 59b and switch unit 59c. Furthermore, when a notification signal indicating a power outage is input to coil 59a (power outage), second relay circuit 59 connects the target load to contacts B of switch unit 59b and switch unit 59c.

[0054] In this way, switching circuit 57 backs up power by utilizing a function of portable power supply device 20 that automatically switches from a pass-through mode or the like to a discharge mode during a power outage. This function normally outputs (pass-through output) AC power input to portable power supply device 20 from distribution board 40 to switching circuit 57, and during a power outage, outputs AC power obtained by discharging storage battery pack 21 included in portable power supply device 20 to switching circuit 57.

[0055] Specifically, under normal circumstances, the switching circuit 57 electrically connects the portable power supply device 20 to the target load and disconnects the leakage current prevention circuit 52 from the first circuit including the portable power supply device 20 and the target load, and during a power outage, the switching circuit 57 electrically connects the portable power supply device 20 to the target load and electrically connects the leakage current prevention circuit 52 to the first circuit.

[0056] The power backup system 10 equipped with such a switching circuit 57 satisfies the above-mentioned internal wiring regulations and can realize AC power backup using the portable power supply device 20.

[0057] In configuration example 2, when power backup system 10 is used without incorporating portable power supply 20 (when the power backup function is not used), output unit OA and input unit IB must be connected by an electrical cord CA (or electrical cord CB) to operate the target load. In configuration example 1, there is no need to connect output unit OA and input unit IB by an electrical cord CA (or electrical cord CB).

[0058] In addition, in configuration example 2, portable power supply device 20 must have a function to automatically switch from pass-through mode or the like to discharge mode during a power outage. In contrast, in configuration example 1, portable power supply device 20 only needs to operate in discharge mode during a power outage, and does not necessarily need to have a function to automatically switch from pass-through mode or the like to discharge mode during a power outage.

[0059] [Variation 1] Next, a first variation of the power backup system 10 will be described. Fig. 12 is an external view of the power backup system according to the first variation. As shown in Fig. 12, in the power backup system 10a according to the first variation, the stand 30 is omitted, and the portable power supply device 20, the wiring box 50, the electric cord CA, and the electric cord CB are unitized. Specifically, the portable power supply device 20, the wiring box 50, and the electric cord CB are housed in a housing 60a, and the plug portion of the electric cord CA is pulled out to the outside of the housing 60a.

[0060] Such a power backup system 10a can realize backup of AC power using a portable power supply device 20. Note that in the power backup system 10a, either the distribution board 40 or the wiring box 50 may be applied to the first or second configuration example.

[0061] [Variation 2] Next, a second modification of the power backup system 10 will be described. Fig. 13 is an external view of the power backup system according to the second modification. As shown in Fig. 13, in the power backup system 10b according to the second modification, the wiring box 50 is omitted, and the stand 30b has the function of the wiring box 50.

[0062] For example, when the above-described configuration example 1 is adopted for the power backup system 10b, the stand 30b is electrically connected to the distribution board 40 via a power line and includes an input unit IB and a switching circuit unit 51. That is, the switching circuit 53 is housed in the stand 30b. In the description of the above-described configuration example 1, the distribution box 50 can be appropriately read as the stand 30b.

[0063] Furthermore, when the above-mentioned configuration example 2 is adopted for the above-mentioned power backup system 10b, the stand 30 is electrically connected to the distribution board 40 by a signal line and includes an input unit IB and a switching circuit unit 56. In other words, the switching circuit 57 is housed in the stand 30b. In the description of the above-mentioned configuration example 2, the distribution box 50 can be appropriately read as the stand 30b.

[0064] Such a power backup system 10b can realize backup of AC power using the portable power supply device 20.

[0065] [Variation 3] Next, a third modification of the power backup system 10 will be described. Fig. 14 is an external view of the power backup system according to the third modification. As shown in Fig. 14, in a power backup system 10c according to the third modification, the wiring box 50 is omitted, and a distribution board 40c has the functions of the wiring box 50 and an output unit OA. Fig. 15 is a diagram showing the internal configuration of the distribution board 40c.

[0066] Like the distribution box 50, the distribution board 40c includes an input unit IB and a switching circuit unit 51. In other words, the distribution board 40c employs the above-described configuration example 1. That is, the switching circuit 53 is housed in the distribution board 40c. In the description of the above-described configuration example 1, the distribution box 50 can be appropriately read as the distribution board 40c.

[0067] Such a power backup system 10c can realize backup of AC power using the portable power supply device 20.

[0068] [Modification of portable power supply device] Portable power supply device 20 allows a user to freely attach and detach storage battery pack 21 from charging / discharging device 22. However, portable power supply device 20 may have a structure in which storage battery pack 21 cannot be detached, such as when storage battery pack 21 is built into charging / discharging device 22.

[0069] Furthermore, the portable power supply device 20 does not necessarily have to have a function for charging the storage battery pack 21 (charging circuit 23). The portable power supply device 20 only needs to have at least a function for discharging the storage battery pack 21 (discharging circuit 24).

[0070] [Effects, etc.] As described above, the power backup system 10 comprises a portable power supply 20, and a switching circuit 53 (or switching circuit 57) that electrically connects the portable power supply 20 to a load during a power outage and electrically connects the leakage current prevention circuit 52 to a first circuit that includes the portable power supply 20 and the load.

[0071] Such a power backup system 10 can realize power backup using a portable power supply device 20.

[0072] Moreover, for example, the power backup system 10 further includes a distribution board 40. The switching circuit 53 normally electrically connects the distribution board 40 to the load, and disconnects the leakage current protection circuit 52 from the second circuit including the distribution board 40 and the load.

[0073] In the event of a power outage, such a power backup system 10 can achieve power backup using the portable power supply device 20 by switching the load connection destination from the distribution board 40 to the portable power supply device 20.

[0074] Also, for example, the switching circuit 57 normally electrically connects the portable power supply device 20 to the load and disconnects the leakage protection circuit 52 from the first circuit.

[0075] Such a power backup system 10 can realize power backup using the portable power supply device 20, with the load remaining connected to the portable power supply device 20 during both power outages and normal times.

[0076] For example, power backup system 10 further includes distribution board 40. Portable power supply device 20 normally outputs AC power input from distribution board 40 to portable power supply device 20 to switching circuit 57, and in the event of a power outage, outputs AC power obtained by discharging storage battery pack 21 included in portable power supply device 20 to switching circuit 57.

[0077] Such a power backup system 10 can achieve power backup by utilizing the function of the portable power supply device 20 that automatically switches from a pass-through mode or the like to a discharge mode in the event of a power outage.

[0078] Furthermore, for example, the switching circuit 53 (or the switching circuit 57) is housed in a distribution box 50 that is separate from both the distribution board 40 and the portable power supply device 20.

[0079] Such a power backup system 10 can use the junction box 50 to realize power backup using the portable power supply device 20.

[0080] Also, for example, the switching circuit 53 (or the switching circuit 57) is housed in the stand 30b of the portable power supply device 20.

[0081] Such a power backup system 10 can realize power backup using the portable power supply device 20 by using the stand 30b.

[0082] Furthermore, for example, the switching circuit 53 is housed in the distribution board 40c.

[0083] Such a power backup system 10 can realize power backup using the portable power supply device 20 by using the distribution board 40c.

[0084] Also, for example, portable power supply device 20 includes a storage battery pack 21 and a charging / discharging device 22 to which storage battery pack 21 is detachably connected and which outputs AC power obtained by discharging storage battery pack 21. Charging / discharging device 22 is an example of a discharging device.

[0085] Such a power backup system 10 can realize power backup using a portable power supply device 20 to which a storage battery pack 21 can be freely attached or detached.

[0086] In addition, the power backup method executed by a computer such as the power backup system 10 includes a switching step of electrically connecting the portable power supply device 20 to the load during a power outage and electrically connecting the leakage current prevention circuit 52 to a first circuit including the portable power supply device 20 and the load.

[0087] Such a power backup method can realize power backup using the portable power supply device 20.

[0088] (Other embodiments) Although the embodiments have been described above, the present invention is not limited to the above-described embodiments.

[0089] For example, in the above embodiment, the power backup system is realized by multiple devices. In this case, the components of the power backup system may be distributed among the multiple devices in any manner. Furthermore, the control system may be realized by a single device, for example, as a single device corresponding to a device equipped with a switching circuit.

[0090] In the above-described embodiment, the processing performed by a specific processing unit may be performed by another processing unit. The order of multiple processing operations may be changed, or multiple processing operations may be performed in parallel.

[0091] In the above-described embodiments, each component may be realized by executing a software program suitable for that component, or by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0092] Furthermore, each component may be realized by hardware. Each component may be a circuit (or integrated circuit). These circuits may form a single circuit as a whole, or each may be a separate circuit. Furthermore, each of these circuits may be a general-purpose circuit or a dedicated circuit.

[0093] Furthermore, the general or specific aspects of the present invention may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-ROM, or as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0094] For example, the present invention may be realized as a power backup method executed by a computer such as a power backup system, or as a control method for a power backup system. The present invention may be realized as a program for causing a computer to execute such a method, or as a computer-readable non-transitory recording medium on which such a program is recorded.

[0095] In addition, the present invention also includes forms obtained by applying various modifications to each embodiment that a person skilled in the art would think of, or forms realized by arbitrarily combining the components and functions of each embodiment within the scope of the present invention. [Explanation of symbols]

[0096] 10, 10a, 10b, 10c Power backup system 20 Portable Power Supply 21 Battery pack 22 Charge / discharge device 23 Charging circuit 24 Discharge circuit 25 Control Unit 26 Selector switch 30, 30b stand 40, 40c distribution board 41 Main breaker 42 Branch breaker 50 Wiring box 51, 56 Switching circuit unit 52 Leakage protection circuit 53, 57 Switching circuit 54, 58 First relay circuit 54a, 55a, 58a, 59a coils 54b, 54c, 55b, 55c, 58b, 58c, 59b, 59c Switch section 55, 59 Second relay circuit 60a housing 70 Grid power supply CA, CB, CC electrical cord

Claims

1. a switching circuit that can be switched to a first state in which a portable power supply device and a load are electrically connected and a ground fault protection circuit is electrically connected to a first circuit that includes the portable power supply device and the load, and that includes the ground fault protection circuit; an input section to which a plug of an electrical cord connected to the portable power supply device is connected; wiring box.

2. The switching circuit switches between the first state and a second state in which the distribution board and the load are electrically connected and the leakage current protection circuit is disconnected from a second circuit including the distribution board and the load. The junction box according to claim 1 .

3. The wiring box is a separate box from both the distribution board and the portable power supply device. The junction box according to claim 1 .

4. The wiring box according to any one of claims 1 to 3; The portable power supply device Power backup system.

5. A portable power supply device; a switching circuit including the leakage current protection circuit, which can be switched to a first state in which the portable power supply device and a load are electrically connected and a leakage current protection circuit is electrically connected to a first circuit including the portable power supply device and the load; Equipped with a distribution board, The portable power supply device is Normally, AC power input from the distribution board to the portable power supply device is output to the switching circuit, In the event of a power outage, AC power obtained by discharging a storage battery provided in the portable power supply device is output to the switching circuit. Power backup system.

6. The portable power supply device is A storage battery and a discharge device to which the storage battery is detachably connected, the discharge device outputting AC power obtained by discharging the storage battery; The power backup system according to claim 5 .

7. A portable power supply device that can be switched to a first state in which a portable power supply device and a load are electrically connected and a leakage current protection circuit is electrically connected to a first circuit including the portable power supply device and the load, and includes the leakage current protection circuit; The portable power supply device is switched between the first state and a second state in which the portable power supply device and a load are electrically connected and the leakage current protection circuit is disconnected from the first circuit. Switching circuit.

8. A portable power supply device that can be switched to a first state in which a portable power supply device and a load are electrically connected and a leakage current protection circuit is electrically connected to a first circuit including the portable power supply device and the load, and includes the leakage current protection circuit; The portable power supply device is housed in a stand. Switching circuit.

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