JP2017216789A - Power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue power supply to a load having high priority in a power supply device for supplying power to a plurality of systems.SOLUTION: A power supply device comprises: a battery 10; a connection unit 13 connected to a commercial power supply; a switching unit 16 for selecting one of the battery and the commercial power supply to supply power from the one to a first and second loads individually; a detection unit for detecting the residual quantity of the battery 10; and a control unit 20 that when the residual quantity of the battery 10 is lower than that of a first stage, continues power supply to the second load 22 while blocking power supply to the first load 21 and, when the residual quantity of the battery then becomes lower than that of a second stage lower than that of the first stage, blocks the power supply to the second load 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply device, and more particularly to a power supply device that controls the operating status of a power supply according to the amount of battery usage.

  2. Description of the Related Art A power supply device that supplies power to a load device that operates with an external power source such as a computer or a communication device is widely used. The power is usually supplied by directly connecting commercial power, while the battery is charged at the same time, and a power supply that supplies power to the load device from a precharged battery at a timing that does not use commercial power is used. It has been.

  There are various timings for receiving power supply from the battery instead of supply from commercial power, but if the battery charging timing is not switched during that time, the amount of power held in the battery will eventually be consumed. . At this time, if the power charged in the battery is completely discharged and then recharged and reused, the battery capacity will be reduced by using up the battery completely. There is a problem of end up.

  Furthermore, there is a problem in that the battery life is greatly reduced by repeatedly charging the battery after it is completely discharged. On the other hand, for example, Patent Document 1 discloses that the battery is prevented from being completely discharged by setting an upper limit of the battery discharge amount in advance.

  On the other hand, the output of the battery is not limited to a single system, and many batteries that supply power to a plurality of systems are used. While the battery itself forms a capacity as a whole, it uses a power supply device by using the same power with a plurality of loads. As described above, power is generally supplied to a plurality of loads through a plurality of systems, but the importance of these loads is not necessarily equal.

JP 2000-245074 A

  While the supply of electric power from the commercial power supply is interrupted, the remaining amount of the battery may be lost. Even in this case, even though the importance of each connected load is different, the battery is equally discharged and the battery is used up. From the standpoint of using the limited remaining battery capacity with multiple loads, there is a load that does not cause a problem even if the power is turned off immediately. There are also loads that want to avoid power interruptions. In such a case, it is necessary to preferentially distribute power to a load having as high a priority as possible. An object of the present invention is to continue supplying power to a load having a high priority in a power supply apparatus that supplies power to a plurality of systems.

  A power supply device according to the present invention selects a battery, a connection unit connected to a commercial power source, one of the battery and the commercial power source, and supplies power to the first load and the second load from either of them. A switching unit to supply, a detection unit for detecting the remaining amount of the battery, and when the remaining amount falls below the first stage, power supply to the first load is cut off while power to the second load is cut off And a control unit that further cuts off the supply of power to the second load when the remaining amount further falls below the second stage below the first stage.

  According to the present invention, when the remaining amount of the battery decreases, the power supply to the first load is cut off first. Therefore, the power to the second load is also cut off after the power cut off to the first load. Can continue to supply. Furthermore, the instability of power supply to the second load can be improved by continuing to supply the power consumed by the first load to the second load by blocking the first load. .

FIG. 2 is a block diagram illustrating a functional configuration of a power supply device of this embodiment. Display screen for mode selection in the power supply. Display screen for setting the amount of discharge in the power supply. The figure explaining the outline | summary of discharge amount setting. The figure which shows transition of the discharge amount and the power disconnection condition to each load. The flowchart explaining the outline | summary of a peak shift process. The flowchart explaining the outline | summary of a two-stage power cutting process.

(Functional configuration of power supply)
It is a block diagram explaining the functional structure of the power supply device of this Embodiment. The power supply device according to the present embodiment selects one of the battery 10, the connection unit 13 connected to the commercial power source, the battery and the commercial power source, and the first load and the second load from either of them. It includes at least a switching unit 16 that supplies electric power, a detection unit 18 that detects the remaining amount of the battery, and a control unit 20 that controls processing for each unit of the power supply device.

  The battery 10 is a rechargeable battery, is a battery capable of storing electricity by repeating charging and supplying power by discharging, and is called a secondary battery, a storage battery, a rechargeable battery, or the like. The connection unit 13 has a terminal connected to commercial power, and one is connected to the switching unit 16 and the other is connected to the battery 10. As a result, the power supplied from the commercial power via the connection unit 13 is supplied to the battery 10 via one side to the load that consumes power via the switching unit 16 and from the other side to the battery 10 via each unit. Realize charging. Therefore, the battery 10 can be replenished with electric power supplied from a commercial power source.

  The switching unit 16 selects and switches between the connection unit 13, that is, the power from the commercial power source and the power from the battery 10, and takes in the power. On the other hand, the power supply can be connected to a plurality of power supplies. In FIG. 1, two power supplies are shown as an example, but a plurality of power supplies of three or more systems may be supplied.

  A (first) load 21 and a (second) load 22 are connected to the switching unit 16 and supply electric power to each. The switching unit 16 supplies power from the commercial power source to both the load 21 and the load 22 when supplying power from the commercial power source. When supplying power from the battery 10, the switching unit 16 supplies power from the commercial power supply to both the load 21 and the load 22 or cuts off the supply of power depending on the state of the battery 10.

  For example, the switching unit 16 supplies power from the commercial power source to the (first) load 21 and the (second) load 22 when the commercial power source is selected, and selects the battery 10 (first). It is also possible to supply power from the battery 10 to at least one of the load 21 and the (second) load 22. The power cutoff control will be described later. The load 21 and the load 22 are electrical appliances that consume power.

  Next, power supply from the connection unit 13 to the battery 10 side will be described. The charging unit 12 is connected to the connecting unit 13. The charging unit 12 is a circuit that receives power supplied from the connection unit 13 and controls charging of the amount of electricity to the battery 10, and includes a power switch element and a backflow prevention diode. The charging unit 12 has a function as a rectifier that supplies supplied power to the cutoff unit 32 as DC power.

  The charging unit 12 is further connected to the blocking unit 32. The interruption | blocking part 32 is a circuit which controls supply and disconnection of electric power. The blocking unit 32 is connected to the battery 10 and is also connected to the switching unit 16 via the inverter 34. When charging is performed by receiving power supplied from commercial power, the charger 12 and the battery 10 are connected. By connecting the battery 10, the battery 10 is charged with electric power from commercial power, while being disconnected from the inverter 34.

  The detection unit 18 detects the remaining amount of the battery 10 or the discharge amount from full charge. As a method for detecting the remaining battery level, there is a method in which a current flowing from the battery 10 to the inverter 34 is measured by an ammeter, and a discharge amount is obtained by an integrated amount of the flowing current. In addition to this, a voltage measurement method for determining the remaining amount by measuring the terminal voltage of the battery cell, a coulomb counter method for determining the remaining amount by measuring the current flowing into and out of the battery cell, the battery cell modeling method, Various systems such as an impedance track system are listed, and the circuit configuration that realizes one of these is realized. The detection unit 18 detects the remaining amount of the battery, for example, detects the remaining amount of the battery 10 from the amount of decrease with respect to the fully charged state of the battery 10.

  When the power from the battery 10 is discharged, the shut-off unit 32 disconnects the charger 12 and supplies the power from the battery 10 to the switching unit 16 via the inverter 34. The blocking unit 32 is a circuit that controls power supply to and from the battery 10. The inverter 34 is a circuit that converts DC power supplied from the battery 10 through the cutoff unit 32 into AC power and supplies the AC power to the switching unit 16. Power from the battery 10 is supplied to the switching unit 16 via the inverter 34.

  The display unit 38 includes a display screen that displays various types of information based on inputs and instructions of various types of information from the control unit 20. On the display screen of the display unit 38, during the normal operation of the power supply device, an output value of electric power (for example, 5 W), an indication that the battery is being discharged, and a remaining battery level (100% when fully charged) are displayed. Display the standard screen to be displayed. Various setting screens such as mode switching shown in FIG. 2 and discharge amount setting shown in FIG. 3 are displayed by the instruction input of the control unit 20 based on the instruction input by the user. In addition, various items set in advance such as a status screen are displayed based on the instruction input.

  Although not shown, the power supply device includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an image processing unit, and a memory. The CPU, ROM, RAM, image processing unit, and memory are connected to each other via a bus.

  The CPU executes various processes according to a program recorded in the ROM or a program loaded from the memory to the RAM. The RAM appropriately stores data necessary for the CPU to execute various processes.

  The image processing unit includes a DSP (Digital Signal Processor), a VRAM (Video Random Access Memory), and the like, and performs various image processing on image data in cooperation with the CPU.

  The memory may be any storage medium such as a DRAM, a cache memory, a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory. The memory includes not only memory connected by a bus but also memory read / written via a drive. The data stored in the present embodiment will be described as being temporarily stored in this memory, both for temporary storage and for long-term storage using a nonvolatile memory.

  An input / output interface is connected to the power supply device. A display unit, an imaging unit, an input unit, and a communication unit are connected via an input / output interface. The input unit includes various buttons and accepts user instruction operations. The communication unit controls communication performed with other devices via a network including the Internet.

  The power supply device has the above-described configurations, but the functional configuration will be described later. Each functional configuration is functionally realized by the cooperative operation of the CPU, ROM, RAM, image processing unit, and memory. The function of each of these units is a module configuration provided by an electronic circuit or a program. The program is stored in the ROM and executed by cooperating with each unit while being appropriately read out by the CPU. Each functional configuration shown in FIG. 1 will be described with reference to FIGS.

  The detection unit 18, the control unit 20, the setting unit 36, and other functional configurations are functional configurations realized by the above-described hardware configuration. The setting unit 36 is configured to perform setting input operations on the power supply device, and performs input to the power supply device via the control unit 20. The display unit 38 displays a predetermined image or character string on the display screen based on the operation of the control unit 20.

(Charge / discharge switching of power supply)
As described above, the power supply device according to the present embodiment can supply the commercial power source to the load 21 and the load 22 together with the charging of the battery 10, and the battery 10 when there is no power supply from the commercial power source. Can be supplied to the load 21 and the load 22.

  As power supply from the power supply from the commercial power supply, the power supply from the battery 10 may be a power failure or a case where the power supply device is carried in an environment where the commercial power supply cannot be used. As described above, when the commercial power supply cannot be used, the control unit 20 determines from the input from the charger 12 that the power supply to the connection unit 13 is lost. In response to the determination result, the blocking unit 32 switches the power supply by blocking the input of power from the charging unit 12 and connecting the input from the battery 10.

  In addition, the power supply can be switched in the peak shift mode. The power consumption is usually not constant during the day, and there is a case where the peak of the power consumption is usually peaked during the daytime and the electricity rate is also high. The peak shift mode is a mode in which power is charged outside these peak hours, and the precharged power is used during the peak hours and the use of commercial power is suppressed during the peak hours. is there. Even in such a peak off mode, the power of the battery 10 is used in the peak time zone.

  As described above, it is conceivable that the power from the battery 10 is used regardless of the presence of the commercial power supply. Thereafter, the control unit 20 determines that the power supply from the commercial power supply has been restored based on the input from the charger. In this case, the shut-off unit 32 switches the power supply by cutting off the power supply to the inverter 34 and switching the connection to the power input from the charging unit 12.

(Interruption of power supply from the battery 10)
As described above, switching between the commercial power supply and the output of the battery 10 is configured to realize uninterruptible power supply. However, the power stored in the battery 10 is recovered without recovering the power supply from the commercial power supply. May be less than a certain amount. If the power stored in the battery 10 reaches the end-of-discharge voltage, the life of the battery 10 is shortened. Therefore, if the power stored in the battery 10 is reduced to a predetermined amount, the battery 10 is discharged. It is set as the structure which complete | finishes.

  The maximum discharge amount when the discharge from the battery 10 is terminated, or the minimum charged amount, that is, the lower limit of the remaining amount of the battery can be set in advance by the setting unit 36. When the set value is reached, the control unit 20 cuts off the power supply from the battery 10 by sending an instruction to the cut-off unit 32. From the setting unit 36, the maximum discharge amount can be set by a ratio with an upper limit of 100%.

  For this purpose, the first stage and the second stage are set by the setting unit 36, respectively. The first stage is the setting of the maximum consumption of power supplied to the load 21 through the first system. The second stage is the setting of the maximum consumption amount of power supplied to the load 22 via the second system. As described above, the setting is not limited to the maximum consumption amount, and may be set by the minimum storage amount (that is, the lower limit of the remaining battery level). Further, when the number of systems is three or more, the third stage, the fourth stage, and the system may be prepared according to the number, respectively, and a plurality of systems may share a specific stage. .

  The amount of electricity stored in the battery 10 (remaining amount of battery) gradually decreases with repeated use. Therefore, the amount of electricity stored at that time is detected by the detection unit 18 with respect to the battery 10, and the amount of electricity stored Set as a ratio. However, if the maximum discharge amount is 100%, there is a problem of shortening the life of the battery 10. Therefore, the upper limit of the maximum discharge amount is less than 100%, for example, 90% and 95%, and the setting amount by the setting unit 36 is less than that. become. Therefore, it can be configured to set the lower limit of the remaining amount of the battery 10 so that it does not become zero.

  In the present embodiment, the setting by the setting unit 36 will be described by taking the maximum discharge amount as an example, but it may be the lower limit of the remaining amount of the battery. That is, a value with a lower limit of 0% is set as the remaining battery level. The actual lower limit is set to 0% or more, for example, 5% or 10% from the relationship with the life of the battery 10, and the set amount by the setting unit 36 is more than that.

  As described above, the maximum discharge amount and the minimum storage amount can be set for each system, but may not be set for all systems. That is, one normal discharge system is not particularly set, and by setting and adjusting the other system, the discharge can be cut in two stages.

  In this case, when the remaining amount of the battery falls below the first stage, the control unit 20 cuts off the power supply to the first system, the (first) load 21, while the second system ( When the supply of electric power to the second load 22 is continued and the remaining amount of the battery 10 further falls below the second stage below the first stage, the supply of electric power to the second load is further cut off. The setting unit 36 may be configured to output an error when the remaining amount of the battery 10 indicated by the first stage is set to be greater than or equal to the remaining amount of the battery 10 indicated by the second stage.

(About the setting screen)
In the power supply device according to the present embodiment, the setting unit 36 can set the peak shift mode, the two-stage OFF mode, and the maximum discharge amount via the display unit 38. These setting screens will be described with reference to FIGS. On the standard screen during normal operation, a screen indicating normal operation is displayed on the display screen of the display unit 38. That is, an output value of power (for example, 5 W), an indication that discharging is in progress, and a remaining battery level (100% in the case of full charge) are displayed. On the other hand, a screen for mode switching and various settings is also displayed.

  FIG. 2 shows a display screen for mode selection in the power supply apparatus. In normal operation, the display unit 38 displays a standard screen. When the mode switching instruction is input on the standard screen, the display unit 38 displays the screen of FIG. By selecting and inputting from these, the setting unit 36 sets the mode. When the normal mode is displayed on the top of the display unit 36 and the normal mode is designated, the setting unit 36 sets the normal operation mode in which no special setting is made for the use of the battery 10.

  Next, the setting unit 36 can also select the peak shift mode. As described above, it can be set to discharge from the battery 10 at the peak time, stop the discharge when the peak time ends, and reconnect to the commercial power source. The setting unit 36 can further set the peak shift time, and can set the start time and the end time of the peak time for discharging from the battery 10 by setting the display unit 38. When the peak time is set by the setting unit 36 and the peak off mode is set from the display screen of FIG. 2, the commercial power source is disconnected and discharged from the battery 10 from the set start time to the end time. Details will be described later.

  Further, the setting unit 36 can set the two-stage OFF mode by selection. When the two-stage OFF mode is set, when the remaining amount of the battery falls below the first stage, the control unit 20 cuts off the power supply to the first load while supplying the power to the second load. If the remaining amount of the battery 10 further falls below the second stage below the first stage, the supply of power to the second load is further cut off.

  The setting unit 36 can also set the discharge test mode. By selecting this mode, the battery is experimentally discharged. The dischargeable test mode may check the dischargeable capacity of the battery 10 and can check whether the battery 10 is still available.

  FIG. 3 shows a display screen for setting the discharge amount in the power supply apparatus. As described in the item “cut off of power supply from the battery 10”, by setting the upper limit of the discharge amount by the setting unit 36, the discharge is cut off when the discharge amount from the battery 10 reaches the set amount. The discharge from the battery 10 is cut off by the unit 32. The maximum discharge amount at this time is set by the setting unit 36 for each mode, and the display screen of the display unit 36 for setting is shown in FIG.

  The display unit 38 displays the maximum discharge amount in the normal mode on the top. The upper limit value of the maximum discharge amount is 100%, but it is not preferable to set the upper limit from the relationship with the life of the battery 10, and for example, it can be set to 90% as shown in FIG. Further, it can be moved up and down depending on the setting. For example, it can be set to 80% or 95%.

  The display unit 38 then displays the maximum discharge amount in the peak off mode. The upper limit value of the maximum discharge amount can be set to 80% or less, for example, 50% as shown in FIG. In the case of the peak off mode, unlike the other modes, when the discharge amount reaches the upper limit, the power supply is not terminated, but only the discharge from the battery 10 is terminated. After the discharge is finished, the battery 10 is switched to the power supply from the commercial power source and the battery 10 is charged again. For this reason, since the discharge amount from the battery 10 may be stopped to some extent, the value is smaller than the upper limit of the discharge amount in other modes.

  The display unit 38 displays the maximum discharge amount in the two-stage OFF mode at the bottom. The upper limit value of the maximum discharge amount can be set to 80% or less, for example, 50% as shown in FIG. When the two-stage OFF mode is operated in the first system, the normal mode is operated in the second system, and therefore the upper limit of the discharge amount is set to be smaller than that in the normal mode. FIG. 3 shows an example in which the upper limit is set to 95% and 70% is set by the setting unit 36.

(Two-stage OFF mode setting)
FIG. 4 is a diagram for explaining the outline of the discharge amount setting. In FIG. 3, the maximum discharge amount in the two-stage OFF mode is shown as 70%, but this example is shown in the graph of FIG. The power consumption is shown in order from left to right, and the leftmost state is a full charge state where no power is consumed. The load 1 is connected to the system 1 and the maximum discharge amount is set as the first stage of the two-stage OFF mode. An example of the first stage is 70%. The load 2 is connected to the system 2 and is set according to the normal mode of FIG. As an example of the second stage, 90% shown in FIG. 3 is set here.

  The setting unit 36 cannot set the maximum discharge amount in the two-stage OFF mode (first stage) to be larger than the set amount in the normal mode (second stage). And set again. For example, as shown in FIGS. 3 and 4, when the maximum discharge amount (first stage) in the two-stage OFF mode is set to 70%, there is no problem because it is smaller than 90% in the normal mode (second stage). However, even if the upper limit is 95% or less, for example, if it is set to 92%, it is larger than 90% in the normal mode, so an error is notified and the process is started again.

  The two-stage OFF mode sets the maximum discharge amount in the first stage with the maximum discharge amount set to be large (the lower limit of the remaining battery level is small) in the first system, while the maximum discharge in the second stage is set in the second system. Operate in normal mode. In addition, although it demonstrates by 2 systems as above-mentioned, it is also possible to set it as 3 or more systems. In this case, the setting unit 36 selects and sets a system that operates in the normal mode (second stage) and a system that sets the maximum discharge amount small (first stage) for each of a plurality of systems.

  At least each system assigned to the power supply device is divided into either a system that operates in the normal mode or a system that sets the maximum discharge amount low, and the system that sets the maximum discharge amount low is the first system in the normal mode. The operating system will be described as an example of the second system.

(Power consumption in 2-stage OFF mode)
FIG. 5 shows the transition of the discharge amount and the state of power disconnection to each load. Since the setting of the discharge amount in the two-stage OFF mode has been described with reference to FIG. 3 and FIG. 4, the power consumption in the power supply apparatus after setting and the power supply status to each system will be described with reference to FIG. The time series will first be described as proceeding to the right as time passes from the left.

  Initially, since power is supplied from a commercial power source, power is not supplied from the battery 10, and the remaining battery level of the battery 10 does not decrease. On the other hand, the electric power from the commercial power source is also supplied to the system 1 and the system 2. Thereafter, the power supply from the commercial power supply is cut off, and the power supply is switched from the battery 10 (not shown). As a result, the remaining battery level of the battery 10 gradually decreases. This is because power from the battery 10 is consumed.

  Then, while the remaining amount of the battery 10 is gradually decreasing, the power consumption amount 70% set for both the system 1 and the system 2 is reached. Since the maximum consumption amount of the system 1 is set to 70% as an example of the first stage, when the power consumption reaches 70% which is the first stage, the cutoff unit 32 cuts off the power consumption to the system 1 .

  On the other hand, the maximum consumption of system 2 is 90% of the normal mode, which is an example of the second stage as shown in FIG. 3 and FIG. Further, when the power supply continues to the system 2, the remaining amount of the battery 10 further decreases and reaches 10%. In the system 2, the maximum consumption is 90%. Shut off power consumption to 2.

  As described above, in the case of power supply from the battery 10, the power supply to the system 1 is terminated early, while the power supply to the system 2 is continued, so that the limited battery 10 The power supply to the grid 1 can be maintained for a long time within the remaining amount range.

  Note that FIG. 5 has been described on the assumption that the power supply from the commercial power supply does not recover. However, if the commercial power supply recovers before the consumption of the battery 10 reaches 90% of the second stage, There is no need to shut off the supply. As a result, uninterrupted power supply can be realized. Further, when the commercial power is restored before the consumption amount of the battery 10 reaches 70% of the first stage, it is not necessary to cut off the power supply for the grid 1 as well.

(flowchart)
FIG. 6 is a flowchart for explaining the outline of the peak shift process. First, the connection unit 13 selects supply of commercial power as usual (step 100). In parallel with this, charging is executed by supplying power to the battery 10 (step 110). The control unit 20 determines whether or not a predetermined peak shift time zone has been reached (step 120). If the peak shift time zone has not been reached, the routine returns to step 100 and repeats normal power feeding.

  When the peak shift time zone is reached, the connection unit 13 switches from the battery 10 to the power supply by cutting off the commercial power supply, and performs the discharging process from the battery 10 (step 130). Here, the control unit 20 determines whether or not a predetermined peak shift time period has ended (step 140). If the peak shift time period has not ended, the process returns to step 130 to repeat normal power feeding. When the peak shift time period ends, the power supply from the battery 10 is terminated, and the process returns to the beginning of this flowchart and is repeated.

  FIG. 7 is a flowchart for explaining the outline of the two-stage power disconnection process. As for the case of shifting to the discharge from the battery 10, in addition to the discharge from the battery 10 in the peak shift process shown in step 130 of FIG. 6, the case where the commercial power source cannot be used as a result of carrying the power supply device, or the case of a power failure, etc. Various cases are possible. In any case, this process is executed when the two-stage OFF mode shown in FIG. 2 is selected at the stage of discharging from the battery 10.

  First, in order to switch to discharging from the battery 10, the blocking unit 32 discharges power from the battery 10 and blocks input from the connecting unit 13 (step 200). Then, the control unit 20 sets the upper limit of the discharge amount of the system 1 from the setting unit 36, that is, the upper limit of the discharge amount of the battery 10 detected from the detection unit 18 as compared with the first stage set by the setting unit 36. It is determined whether or not the first stage is reached (step 210). If the first stage has not been reached, the process returns to step 200 and discharge from the battery 10 is continued.

  When the discharge amount of the battery 10 has reached the upper limit of the discharge amount of the system 1, that is, the first stage set by the setting unit 36, the power supply from the switching unit 16 to the system 1 is cut off (step 220). . On the other hand, power supply to the grid 2 continues. And the control part 20 determines whether the discharge amount of the battery 10 detected from the detection part 18 has reached the 2nd step compared with the 2nd step which is the upper limit of the discharge amount of the system | strain 2. (Step 230). If the second stage which is the upper limit has not been reached, discharging from the battery 10 is continued (step 250), and the process is repeated.

  When the discharge amount of the battery 10 has reached the upper limit of the discharge amount of the grid 2, the power supply from the switching unit 16 to the grid 2 is cut off (step 240). Since the power supply to all the systems has been completed, the power supply process for the battery 10 is terminated.

  As described above, according to the present embodiment, even when a secondary battery is used in the absence of power supply from a commercial power supply, the upper limit value of the discharge amount of the secondary battery in two stages for each system Is set. Therefore, when the remaining amount of the battery decreases, the power supply to the first load is cut off first, so that the power supply to the second load is continued even after the power supply to the first load is cut off. Can do. Furthermore, the instability of power supply to the second load can be improved by continuing to supply the power consumed by the first load to the second load by blocking the first load. .

Battery 10, charging unit 12, connection unit 13, switching unit 16, detection unit 18, control unit 20, load 21, load 22, cutoff unit 32, inverter 34, setting unit 36, display unit 38

Claims (4)

Battery,
A connection connected to a commercial power source;
A switching unit that selects one of the battery and the commercial power source and supplies power to the first load and the second load from either of the battery and the commercial power source,
A detection unit for detecting the remaining amount of the battery;
If the remaining amount falls below the first stage, the supply of power to the first load is interrupted while the supply of power to the second load is continued, and the remaining amount falls below the first stage. When the level further falls, a control unit that further cuts off the power supply to the second load;
A power supply device comprising: The battery can be replenished with a remaining amount of power supplied by the commercial power source,
The power supply device according to claim 1, wherein the detection unit detects a remaining amount of the battery from a decrease amount with respect to a fully charged state of the battery. The switching unit supplies power from the commercial power source to the first load and the second load when the commercial power source is selected, and the first load and the second when the battery is selected. Supplying power from the battery to at least one of the second loads;
The power supply device according to claim 1 or 2. A setting unit for setting the first stage and the second stage;
The said setting part outputs an error, when the remaining amount of the said battery which the said 1st step shows is set more than the remaining amount of the said battery which the said 2nd step shows. Power supply.