Switching circuit and power backup system

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 the commercial power source is restored, even if the load is an inductive load or a capacitive load. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-131423 A 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 protection circuit to a first circuit that includes 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 and a load during a power outage, and electrically connecting a leakage current protection circuit to a first circuit including the portable power supply device and the load. Effect 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 description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a power backup system according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of use of the portable power supply device according to the embodiment. [Diagram 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 showing the components of a portable power device used in pass-through mode. [Figure 5B] FIG. 5B is a diagram illustrating the components of a portable power device when used in charging mode. [Figure 5C] FIG. 5C illustrates the components of a portable power supply used in a discharge mode. [Figure 5D] FIG. 5D is a diagram illustrating the components of a portable power device 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 showing a schematic configuration of a switching circuit unit according to the first configuration example. [Figure 8] FIG. 8 is a diagram showing 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 showing a schematic configuration of a switching circuit unit according to the second configuration example. [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 the 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 an internal configuration of a distribution board according to the third modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 arrangement and connection forms, steps, and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. In addition, among the components in the following embodiments, components that are not described in the independent claims will be described as optional components.

[0010] In addition, each drawing is a schematic diagram and is not necessarily a precise illustration. In addition, in each drawing, the same reference numerals are used for substantially the same configuration, and duplicated explanations 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 during a power outage to loads such as lighting fixtures connected to a distribution board 40 using a storage battery pack 21 and a charging / discharging device 22. A power outage here means, for example, a state in which power supply from a system power source 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] [Example of portable power supply device configuration] 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 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 device 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 portable power supply device by itself. 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 has 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 electric cord CC in FIG. 3, the load may be directly connected to the output unit OC. In this way, the storage battery pack 21 can function as a portable power supply device by itself.

[0016] The specific configuration of the 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 the portable power supply device 20.

[0017] The battery pack 21 of the portable power supply device 20 is detachably connected to a 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 change-over 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 unit (the end opposite to the plug unit) of an electric cord CA is connected to the input unit IA. In the power backup system 10, the plug unit of the electric cord CA is connected to an output unit OA (outlet) connected to a branch circuit branched off from the distribution board 40.

[0020] The output unit OB is a terminal for the charging / discharging device 22 to output 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, a connection portion of the electric cord CB (the end opposite to 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 storage 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 changeover switch 26. The control unit 25 is realized by, for example, a microcomputer, and the function of the control unit 25 is realized by, for example, an internal processor executing a computer program stored in an internal memory.

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

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

[0026] The charging mode is an operation 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 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 operation mode in which AC power is output (discharged) from output unit OB using DC power stored in battery pack 21. Fig. 5C is a diagram showing components of portable power supply device 20 used in the discharge mode. Specifically, control unit 25 controls discharge circuit 24 to enable output of AC power from output unit OB using DC power.

[0028] The charge + pass-through mode is an operation mode in which AC power is output (discharged) from output unit OB using DC power stored in battery pack 21. Fig. 5D is a diagram showing 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 cut off (when a power outage occurs, etc.) 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 executing the pass-through mode, etc., it has a function of automatically transitioning to the discharge mode in response to this. In addition, when the input of AC power to the input unit IA is started while operating in the discharge mode, it also has a function of automatically transitioning to the pass-through mode, etc. These functions may be defined as operation modes other than the above four operation modes (such as a backup mode) and may be switchable by the changeover switch 26.

[0030] [Distribution board and wiring box configuration example 1] Next, there are two possible configuration examples for the distribution board 40 and the wiring box 50. Configuration example 1 of the two configuration examples 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 a 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 the 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. The 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 within the facility by connecting a load (a plug for an electrical device) to the output unit OA (outlet).

[0034] The wiring 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 the branch circuits connected to the distribution board and the circuits connected to the wiring box 50. Hereinafter, a load at the end of a circuit connected to the wiring box 50 will also be referred to as a target load. The wiring box 50 includes an input unit IB and a switching circuit unit 51.

[0035] A connection portion 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. That is, AC power can be input from the portable power supply device 20 to the input portion IB.

[0036] The switching circuit unit 51 supplies AC power to a target load during normal operation (non-power outage) when AC power is being input from the distribution board 40 to the wiring box 50, and supplies AC power from the portable power supply device 20 input to the input section IB to the target load during a power outage when the AC power from the distribution board 40 to the wiring box 50 is stopped. Fig. 7 is a diagram showing a schematic configuration of the switching circuit unit 51, and Fig. 8 is a diagram showing a detailed configuration of the 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] The switching circuit 53 normally electrically connects the distribution board 40 and the target load, and supplies AC power from the distribution board 40 to the target load after disconnecting the leakage current protection circuit 52 from the circuit including the distribution board 40 and the target load (in other words, the electric circuit between the distribution board 40 and the target load; hereinafter also referred to as the second circuit). In addition, during a power outage, the switching circuit 53 electrically connects the portable power supply device 20 and the target load in place of the distribution board 40, and electrically connects the leakage current protection circuit 52 to the circuit including the portable power supply device 20 and the target load (in other words, the circuit between the portable power supply device 20 and the target load; hereinafter also referred to as the first circuit), and supplies AC power from the portable power supply device 20 to the target load. Specifically, the switching circuit 53 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 unit 54b and the switch unit 54c when an AC current flows through the coil 54a (i.e., during normal operation when AC power is input from the distribution board 40 to the wiring box 50). The first relay circuit 54 turns on the switch unit 54b and the switch unit 54c when no AC current flows through the coil 54a (i.e., during a power outage when AC power is not input from the distribution board 40 to the wiring 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 (power outage), the second relay circuit 55 electrically connects a 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 20 to the target load, and also electrically connects the leakage current prevention circuit 52 to the first circuit that includes the portable power supply 20 and the target load, thereby enabling AC power to be supplied from the portable power supply 20 to the target load.

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

[0043] The switching circuit unit 51 normally disconnects the leakage current protection circuit 52 from the target load in order 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] [Distribution board and wiring box configuration example 2] Next, a configuration example 2 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 configuration example 2 of the distribution board 40 and the wiring box 50. Note that in the following description of configuration example 2, differences from configuration example 1 will be mainly described, and matters already mentioned in configuration example 1 will be omitted.

[0045] The distribution board 40 in the configuration example 2 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 the configuration example 2 are the same as those in the 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 connection portion 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. That is, AC power can be input from the portable power supply device 20 to the input portion IB.

[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 a normal state, 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] The switching circuit 57 electrically connects the portable power supply device 20 and the target load both during normal operation and during a power outage, and supplies AC power from the portable power supply device 20 to the target load. As described above, the portable power supply device 20 has a function of automatically switching from a pass-through mode or the like to a discharge mode during a power outage, so that the supply of AC power to the target load continues 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 a first relay circuit 58 and a second relay circuit 59.

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

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

[0054] In this way, the switching circuit 57 backs up power by utilizing a function of the 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) the AC power input to the portable power supply device 20 from the distribution board 40 to the switching circuit 57, and during a power outage, outputs to the switching circuit 57 the AC power obtained by discharging the storage battery pack 21 included in the portable power supply device 20.

[0055] Specifically, under normal circumstances, the switching circuit 57 electrically connects the portable power supply 20 to the target load and disconnects the leakage current protection circuit 52 from a first circuit that includes the portable power supply 20 and the target load, and during a power outage, the switching circuit 57 electrically connects the portable power supply 20 to the target load and electrically connects the leakage current protection 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 backup of AC power using the portable power supply device 20.

[0057] In configuration example 2, when using the power backup system 10 without incorporating the portable power supply device 20 (without using the power backup function), it is necessary to connect the output unit OA and the input unit IB with an electric cord CA (or an electric cord CB) in order to operate the target load. In configuration example 1, it is not necessary to connect the output unit OA and the input unit IB with an electric cord CA (or an electric cord CB).

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

[0059] [Variation 1] Next, a first modified example of the power backup system 10 will be described. Fig. 12 is an external view of the power backup system according to the first modified example. As shown in Fig. 12, in the power backup system 10a according to the first modified example, 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 the portable power supply device 20. Note that in the power backup system 10a, either of configuration example 1 and configuration example 2 may be applied to the distribution board 40 and the wiring box 50.

[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 a 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-mentioned configuration example 1 is adopted for the power backup system 10b, the stand 30b is electrically connected to the distribution board 40 by 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-mentioned configuration example 1, the wiring 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. That is, the switching circuit 57 is housed in the stand 30b. In the explanation of the above-mentioned configuration example 2, the wiring 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] The distribution board 40c includes an input unit IB and a switching circuit unit 51, similar to the wiring box 50. That is, the distribution board 40c employs the above-mentioned configuration example 1. That is, the switching circuit 53 is accommodated in the distribution board 40c. In the description of the above-mentioned configuration example 1, the wiring 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] [Modifications of portable power supply devices] In the portable power supply device 20, a user can freely attach and detach the storage battery pack 21 from the charging / discharging device 22. However, the portable power supply device 20 may have a structure in which the storage battery pack 21 cannot be removed, such as by having the storage battery pack 21 built into the charging / discharging device 22.

[0069] Furthermore, the portable power supply device 20 does not necessarily have to have a function of charging the storage battery pack 21 (charging circuit 23). The portable power supply device 20 only needs to have at least a function of 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 device 20, and a switching circuit 53 (or switching circuit 57) that electrically connects the portable power supply device 20 to a load during a power outage and electrically connects the leakage current protection circuit 52 to a first circuit that includes the portable power supply device 20 and the load.

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

[0072] 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 separates 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 connection destination of the load 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 separates the leakage current protection circuit 52 from the first circuit.

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

[0076] For example, power backup system 10 further includes a 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 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.

[0077] Such a power backup system 10 can achieve power backup by utilizing a function provided in 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] Also, 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 realize power backup using the portable power supply device 20 by using the distribution box 50.

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

[0085] Such a power backup system 10 can realize power backup by using a portable power supply device 20 to which a storage battery pack 21 can be freely attached and 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 and a load during a power outage, and electrically connecting the leakage current protection 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 embodiment has been described above, the present invention is not limited to the above embodiment.

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

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

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

[0092] Furthermore, each component may be realized by hardware. Each component may be a circuit (or an 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 may be realized 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 may think of, or forms realized by arbitrarily combining the components and functions of each embodiment without departing from the spirit 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 Changeover 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 Case 70 Grid power supply CA, CB, CC Electrical Code

Claims

1. A portable power supply device; and a switching circuit that electrically connects the portable power supply device and a load during a power outage and electrically connects a leakage current protection circuit to a first circuit that includes the portable power supply device and the load. Power backup system.

2. In addition, it is equipped with a distribution board, The switching circuit includes: In a normal state, 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 power backup system according to claim 1 .

3. The switching circuit electrically connects the portable power supply device to a load and disconnects the leakage current protection circuit from the first circuit under normal conditions. The power backup system according to claim 1 .

4. In addition, it is equipped with a distribution board, The portable power supply device is In normal operation, the 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, the portable power supply device outputs AC power obtained by discharging a storage battery provided in the portable power supply device to the switching circuit. The power backup system according to claim 3 .

5. The switching circuit is housed in a box separate from both the distribution board and the portable power supply device.

5. The power backup system according to claim 2 or 4.

6. The switching circuit is housed in the base of the portable power supply device.

5. The power backup system according to claim 2 or 4.

7. The switching circuit is housed in the distribution board. The power backup system according to claim 2 .

8. The portable power supply device is A storage battery, 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 any one of claims 1 to 7.

9. 1. A computer-implemented power backup method, comprising: A switching step is included for electrically connecting a portable power supply device and a load during a power outage, and electrically connecting a leakage current protection circuit to a first circuit including the portable power supply device and the load. Power backup method.

10. A program for causing the computer to execute the power backup method according to claim 9.

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