JPH09135541A - Power feed system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to supply power stably to a load system wherein important loads and general loads are mixed by preliminarily setting the priority of turning on and off of a plurality of switches when a power supply is stopped by a power failure or the voltage is abnormal. SOLUTION: An AC power supply 1-1 is connected to switches 4-1 to 4-n on the output side through an input-side switch 2-1 in a feed controller 6 and a power line 11. The names of loads 5-1 to 5-n connected to the output-side switches 4-1 to 4-n and the priority which is set for the output-side switches 4-1 to 4-n are declared and the priority can be set according to the importance of the loads 5-1 to 5-n. By this method, power can be supplied stably to a load system wherein important loads and general loads are mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system, and more particularly to a power supply system for supplying power to a load system having an important load such as a computer-related device that requires high reliability in a power supply.

[0002]

2. Description of the Related Art Conventionally, a power supply system for supplying electric power to a load system having an important load that requires high reliability in a power supply generally has a structure as described in "Hei 4-325832". Power supply systems have been widely used.

In this configuration, while the commercial frequency AC power input from the power system is supplied to the general load and the important load, the AC power is input to the uninterruptible power supply unit and converted into DC power within the unit, and this DC power is supplied. The power is stored in the storage battery inside the uninterruptible power supply, and the power supply to the general load is stopped in the event of a system failure such as a power failure.However, for important loads, the commercial frequency is applied from both ends of this storage battery via the reverse converter. It is a form of returning to the alternating current and continuing the power supply.

[0004]

However, in this conventional system, since it is necessary to separate the power line connecting the important load and the general load, in the general load system of society in which the important load and the general load are mixed, the power line There is a problem that the wiring becomes complicated. Particularly in office buildings and the like, with the spread of computer-related devices such as workstations and personal computers, the number of devices connected as important loads is increasing year by year. Also,
These important loads are required to be able to freely change the installation location by remodeling or changing the layout of the building by so-called downsizing. However, the above-mentioned conventional configuration has a problem that a new wiring work is required every time an important load is introduced or moved.

Therefore, the present invention solves such a problem, and an object thereof is to provide an inexpensive power supply system for stably supplying electric power to a load system in which important loads and general loads are mixed. To provide.

[0006]

The features of the present invention for achieving the above object are as follows.

At least one input power supply, a plurality of loads connected to the input power supply, and a plurality of switches respectively inserted between the input power supply and the plurality of loads,
An opening / closing control device for turning on / off the plurality of switches,
A power supply system having an uninterruptible power supply device connected between the input power source and the plurality of switches, wherein a priority order when turning on or off the plurality of switches can be set in advance. is there. Here, the switching control device is connected between the input power supply and the plurality of switches, and transmits a command for turning on or off the plurality of switches from the switching control device to the plurality of switches. If
This is performed by an electric signal superimposed on a power line between the switching control device and the plurality of switches. In this system, when a power failure or a voltage abnormality occurs in one of the input power sources, a power failure or a voltage abnormality in the input power source is detected and the power is switched from the other input power source or the uninterruptible power supply unit. Of the plurality of switches, only at least one switch having the lowest preset priority is turned off, and only the power supply to the load connected to the switch is stopped.

Further, in this power supply system, when the above-mentioned state continues even after a lapse of a predetermined time after the occurrence of the power failure or the voltage abnormality, the switches having lower priority are turned off in order. . Alternatively, it is also desirable to perform a treatment to stop the operation of the load connected to the switch that is in the ON state among the switches, and then turn off the switch connected to the load after confirming that the load has stopped operating. .

On the other hand, after the operation of stopping the power supply to a part of the loads due to the power failure or the voltage abnormality, when the state of the power failure or the voltage abnormality is resolved, the input power source from which the state of the power failure or the voltage abnormality is resolved The power supply is switched to the above power supply and the switch which has been turned off is turned on again.

Further, when the total value of the power consumption of the load exceeds a predetermined capacity, the uninterruptible power supply is supplied to the load at the same time, and a preset priority of the plurality of switches is set. Turning off only at least one switch having a low frequency and stopping only power supply to a load connected to the switch, or using a power supply device by photovoltaic power generation for at least one of the input power supplies, When the output power of the power supply device by the photovoltaic power generation becomes equal to or less than a predetermined value, the power of the uninterruptible power supply device is simultaneously supplied to the load, and the preset priority of the plurality of switches is Only at least one switch, which is low, is turned off and only the power supply to the load connected to the switch is stopped.

The priority of turning on or off the plurality of switches may be changed according to the time of day.

The plurality of switches are turned on or off by comparing the set value according to the priority input in advance to each switch with the command value output from the switch control device. .

The switch performs a process of stopping the operation of a load connected to the switch according to a command output from the switch control device, and after confirming that the load has stopped operating, the switch is switched off. The set value of the priority may be changed to a lower value than before, and each of the switches can set the priority arbitrarily and display the set priority.

In addition, switching a plurality of the input alternating currents according to a power rate, instructing the ON / OFF of the plurality of switches from the uninterruptible power supply, and each of the switches is a type of load. It is possible to set, and has a function of displaying the type of load that has been set, each of the switches has a function of displaying the operating state of the switch and the current power consumption of the load, Each of the switches has a terminal for connecting a communication line for communicating with the load, has a function of constantly monitoring the states of the input power source and the load, and predicting the future state, and the prediction. The output information is output from the terminal to the outside.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a first power supply system according to the present invention.
FIG. 3 is a configuration diagram showing an example of the embodiment. Further, FIG. 2 is a diagram showing an on / off state of the switch.

In FIG. 1, 1-1 is an AC power source, 2-1
Is an input side switch, 3 is a voltage detector, 4-1 to 4-n are output side switches, 5-1 to 5-n are loads, 6 is a power supply control device, 7
Is a switching control circuit, 8 is a switch, 9 is an uninterruptible power supply, 1
Reference numeral 0 is a storage battery, and 11 is a power line.

In FIG. 1, the AC power source 1-1 is input to the power feeding control device 6 and is connected to the input side switch 2-1 inside the power feeding control device 6. Input side switch 2-1 is power line 1
Connected to 1. Further, the voltage detector 3 is provided on the input side of the input side switch 2-1. The output of the voltage detector 3 is input to the switching control circuit 7 and the uninterruptible power supply 9. Power line 11
Is drawn out of the power supply control device 6, and the output side switch 4
-1 to 4-n are connected. These output side switches 4-1
Loads 5-1 to 5-n are respectively connected to ˜4-n. Output side switches 4-1 to 4-n are loaded 5-1 to 5-1.
It is installed relatively close to 5-n.

Inside the power supply control device 6, an uninterruptible power supply device 9 is connected to a power line 11 via a switch 8. A storage battery 10 is connected to the uninterruptible power supply 9. Further, the output from the switching control circuit 7 is input to the power line 11.

Next, the operation of this embodiment will be described.

The AC power source 1-1 is connected to the output side switches 4-1 to 4-n via the input side switch 2-1 and the power line 11 inside the power feeding control device 6. Normally, these input side switch 2-1 and output side switches 4-1 to 4-n
Are all in the ON state, and the power of the AC power supply 1-1 is supplied to and consumed by the loads 5-1 to 5-n. On the other hand, the switch 8 is also turned on inside the power supply control device 6, and the uninterruptible power supply device 9 performs an AC / DC conversion operation to store DC power in the storage battery 10.

The output side switches 4-1 to 4-n are provided with means for setting priorities in accordance with the importance of the loads 5-1 to 5-n connected to them.

In FIG. 2, the names of the loads 5-1 to 5-n connected to the output side switches 4-1 to 4-n and the output side switch 4 are shown.
The priorities set in -1 to 4-n are shown. The loads 5-1 and 5-2 are important loads such as workstations and personal computers, and 5-3 to 5-n are general loads. Therefore, the output side switches 4-1 and 4-2 have a high priority (H), and the other output side switches 4-3 to 4-4.
The priority of n is set low (L).

When a power failure occurs in the AC power supply 1-1 in this state, the voltage detector 3 detects the power failure and transmits a power failure signal to the switching control circuit 7 and the uninterruptible power supply 9. The uninterruptible power supply 9 stops the AC / DC conversion operation up to that point, performs a DC / AC conversion operation that is an inverse conversion, and outputs AC power from the storage battery 10 to the power line 11.

On the other hand, the switching control circuit 7 receives the signal from the voltage detector 3 and outputs the A signal to the power line 11. The A signal is superimposed on the AC of the power line 11 and transmitted to the input side switch 2-1 and the output side switches 4-1 to 4-n. Input side switch 2-
1 receives this A signal and turns off. On the other hand, each of the output side switches 4-1 to 4-n receives this A signal and operates according to a preset priority. That is, in the A signal, the output switch whose setting priority is L is turned off, and the output switch whose setting priority is H is maintained in the on state. As a result, only the important load is supplied with the power from the uninterruptible power supply 9.

Further, the power failure state continues for a long time, and the storage battery 10
When the electric discharge ends, the switching control circuit 7 outputs the B signal to the power line 11. This B signal is a signal that turns off all output side switches, and power supply to all the loads 5-1 to 5-n is stopped.

On the other hand, when the AC power source 1-1 recovers power,
The voltage detector 3 detects the power recovery and transmits the power recovery signal to the switching control circuit 7. The uninterruptible power supply 9 is the D
The C / AC conversion operation is stopped, the DC / AC conversion operation is performed again, and the storage battery 10 is charged with DC power.

On the other hand, the switching control circuit 7 receives the power recovery signal from the voltage detector 3 and outputs a 0 signal to the power line 11. The 0 signal is superimposed on the AC of the power line 11 and transmitted to the input side switch 2-1 and the output side switches 4-1 to 4-n. The input side switch 2-1 and the output side switches 4-1 to 4-n all turn on upon receiving this 0 signal. As a result, all the loads are supplied with the electric power from the AC power supply 1-1 again.

As described above, in the present invention, by setting the priority of the switch in advance, it is possible to supply the emergency power from the uninterruptible power supply to an arbitrary load during a power failure. Therefore, even if the importance of the load connected to the switch is changed due to the renovation of the building, the layout change, or the introduction of a new device, the user need only change the switch settings. There is no need for new power supply work as in the past.

Further in accordance with the present invention, the switch is turned on,
The signal to turn off is superimposed on the power line by simple 3
Since there are only the types of signals, new wiring is not required, and the existing power supply line can be used as it is to easily construct the configuration of the present invention.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 3 shows a second power supply system according to the present invention.
FIG. 3 is a configuration diagram showing an example of the embodiment. Further, FIG. 4 is a diagram showing an on / off state of the switch.

In FIG. 3, the same components as those in FIG. 1 are designated by the same symbols as in FIG. In addition, 12 is a signal line,
13-1 to 13-n are connectors.

The configuration of FIG. 3 is basically the same as the configuration of FIG. The difference from FIG. 1 is that output side switches 4-1 to 4-4.
-N is provided with connectors 13-1 to 13-n, respectively, and the signal line 1 is provided between the connector 13-1 and the load 5-1.
2 is connected. The circuit configuration of this embodiment is almost the same as that of the first embodiment, but the on / off operation of the output side switches 4-1 to 4-n at the time of power failure is partly different from that of the first embodiment. That is, as shown in FIG. 4, the setting priority is set to three levels, and the priority is high in the order of H, M, and L. Further, the output signal of the switching control circuit has three stages of A, B, and C. First, at the time of a power failure, the output side switches 4-3 to 4 having the priority level L by the A signal from the switching control circuit
-N turns off, and only the loads 5-1 and 5-2 are supplied with power from the uninterruptible power supply 9. Next, after a lapse of 2 minutes, if the power failure is still continuing, the B signal is output. The B signal is a command for shutting down the computer, which is the load of the setting priority M. This B
The signal is transmitted from the connector 13-1 shown in FIG. 3 to the load 5-1 computer via the signal line 12. The computer of the load 5-1 automatically performs the processing of shutting down the system according to this instruction. Then, 5 minutes later, the C signal is output, and the switch 4-2 having the setting priority M is turned off. Although the load of the setting priority H is not turned off in the present embodiment, it is also possible to stop the power supply to all the loads by adding a signal of one more stage. Further, although the setting priority is set to three levels in the present embodiment, more detailed control can be performed by further increasing the level.

Further, in this embodiment, the loads 5-1 to 5-
When the total value of the power consumption of n becomes equal to or more than a predetermined value, the uninterruptible power supply device 9 performs a reverse conversion operation to supply the power stored in the storage battery 10 to the loads 5-1 to 5-n. Have When the power consumption continues to exceed the predetermined value for a certain period of time or longer, the output side switches having lower priorities are sequentially turned off.

Further, in this embodiment, it is possible to change the priority order depending on the time zone. For example, in the daytime, the priority of electric lights is low, but at night, the priority of some of the electric lights is increased so that it can be used as an emergency light when a power failure occurs at night. It is possible.

In this embodiment, an increase / decrease in the power consumption of the load is predicted, and when it is considered that the power consumption becomes excessive, a message is displayed to call attention to each of the output side switches 4-1 to 4-n. In addition, it is possible to control ON / OFF of the switch in consideration of load priority and power consumption.

Now, a third embodiment will be described with reference to FIGS. 5, 6, 7 and 8. First, FIG. 5 is a front view of one of the output side switches 4-1 to 4-n. In this figure, 41 is a lever, 42 is a display panel, 43 and 44 are selection keys, 45 is a decision key, and 46 is a mode switching key.

FIG. 6 shows a priority setting mode display screen.
Further, FIG. 7 is an operation state and power consumption display screen.
FIG. 8 is an operation status display screen.

Next, this embodiment will be described with reference to these drawings. In FIG. 5, the lever 41 of the output side switch 4 is a switch for manually selecting ON / OFF, and is similar to a general FFB. The display panel 42, the selection keys 43 and 44, the enter key 45, and the mode switching key 46 are used as follows.

First, the mode switching key 46 is used to display the display screen shown in FIG. 6, and the load priority is set. This selects the type of equipment with the selection keys 43 and 44,
By pressing the decision key 45, the priority of the load is decided.

Next, the display screen of the current operating state and power consumption is as shown in FIG. 7, and displays the type and operating state of equipment and the current power consumption. Regarding the power consumption, the power of the load connected to this switch,
It is possible to display the power consumption of the load of the entire building. Further, FIG. 8 is a screen for displaying the operation state, and is configured to display the current state especially in case of a power failure.

Next, FIG. 9 shows a fourth embodiment of the present invention.

In FIG. 9, the same components as those in FIGS. 1 and 3 are designated by the same symbols. In addition, other components unique to FIG. 9 are an AC power source 1-2, and an input side switch 2-2.

The configuration of FIG. 9 is basically the same as the configuration of FIG. 3 is different from FIG. 3 in that an AC power source 1-2 is added and connected to an input side switch 2-2 inside the power supply control device 6, and an output side of this input side switch 2-2 is connected to a power line 11. The AC power supply 1-1 and the AC power supply 1-2 are connected in parallel. The voltage detector 3 is an AC power source 1-1.
It is configured to monitor both the states 1 and 1-2.

Next, the operation of FIG. 9 will be described. Since the operation of FIG. 9 is basically the same as the operation of the above-described embodiment, only the points different from the previous embodiment will be described.

In the embodiment shown in FIG. 9, an AC power source 1-2 is newly provided and is connected in parallel with the AC power source 1-1 as described above. Then, normally, only one of the input side switches is turned on, and power is supplied to the loads 5-1 to 5-n from any of the AC power supplies. Here, assuming that the AC power supplies 1-1 and 1-2 are power supplies of different power supply companies, the power charges per unit time for the same power consumption are not necessarily the same. For this reason, in the present embodiment, the power is received from the AC power source with the lower power rate.

Next, a fifth embodiment according to the present invention will be described with reference to FIG.
This will be described with reference to FIG. 10, the same components as those in FIGS. 1, 3 and 9 are designated by the same symbols. In addition, 14 in FIG. 10 is a solar power generation device.

The configuration of FIG. 10 is basically the same as the configuration of FIG. 9 is different from the AC power supply 1-2 of FIG.
Is deleted, the solar power generation device 14 is inserted in its place, and the opening / closing control device 7 is deleted.

Next, the operation of the embodiment shown in FIG. 10 will be described.
The operation of FIG. 10 is basically the same as the operation of the above-described first, second and fourth embodiments, and therefore only the points different from the previous embodiment will be described.

In the embodiment shown in FIG. 10, the solar power generator 14 is used.
Is newly provided. This solar power generation device 14
This device has a configuration in which the energy of sunlight is converted into DC power by a solar cell, and further converted into AC power of commercial frequency by using an inverter. In this embodiment, the photovoltaic power generation device 14 is connected in parallel to the AC power supply 1-1, and normally both the input side switches 2-1 and 2-2 are turned on to load the loads 5-1 to 5-n. Supply power.

In the present embodiment, when the electric power supplied from the solar power generation device 14 becomes lower than a predetermined value, the uninterruptible power supply device 9 is reversely converted and the electric power stored in the storage battery 10 is applied to the load 5. It has a function of supplying -1 to 5-n.
With this function, fluctuations in the electric power input from the AC power supply 1-1 can be suppressed even when the power generation amount of the solar power generation device 14 suddenly changes, and the quality such as the voltage or frequency of the power system can be maintained. Can also contribute.

Further, in this embodiment, the switching control circuit 7 used in the other embodiments is deleted, and the uninterruptible power supply 9 has that role. That is, when the power detector 3 detects a power failure of the AC power supply 1-1, the power failure signal is input to the uninterruptible power supply 9. In the uninterruptible power supply device 9, the AC / DC conversion that has been performed so far is stopped, and the DC power of the storage battery 10 is output to the power line 11 by the DC / AC conversion.
At this time, the input side switch 2-1 is turned off by superimposing a signal for turning the switch on and off on the AC waveform output from the uninterruptible power supply 9 to the power line 11.
Among the output side switches 4-1 to 4-n, the switch having the lowest setting priority is turned off. One of the methods of superimposing the switch OFF signal on the output AC waveform of the uninterruptible power supply 9 is to create a signal having a frequency sufficiently higher than that of commercial AC and superimpose it. Further, it is conceivable that the output waveform of the uninterruptible power supply is not a sine wave alternating current, but a pulse wave having positive and negative amplitudes, and the waveform of this pulse wave is changed so that it also serves as several types of signal waves.

According to the present embodiment, by providing the uninterruptible power supply device 9 with the function of opening / closing control, it is possible to construct a cheaper and smaller power supply system.

[0055]

According to the present invention, it is possible to supply the emergency power from the uninterruptible power supply to an arbitrary load at the time of power failure by presetting the priority of the switch. Therefore, even if the importance of the load connected to the switch is changed due to the renovation of the building, the layout change, or the introduction of a new device, the user need only change the switch settings. There is no need for new power supply work as in the past.

Furthermore, according to the present invention, the switch is turned on,
The signal to turn off is superimposed on the power line by simple 3
Since there are only the types of signals, new wiring is not required, and the existing power supply line can be used as it is to easily construct the configuration of the present invention.

Further, according to the present invention, it is also possible to receive electric power from the AC power source having a lower electric power rate. Furthermore, it can be easily deployed to systems with small-scale distributed power sources such as photovoltaic power generators, and even when the power generation amount of the distributed power sources fluctuates rapidly, there is a sharp fluctuation in the input power from the grid. It can be suppressed, and it can contribute to maintenance of quality such as voltage or frequency of the power system.

As described above, according to the present invention, an inexpensive and small power feeding system can be easily constructed. Therefore, such a power supply system is most suitable for introduction into an office building or the like.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram showing a first embodiment of a power feeding system according to the present invention.

FIG. 2 is a table summarizing the operations of the switch control circuit and the switch in the first embodiment of the power supply system according to the present invention.

FIG. 3 is a circuit configuration diagram showing a second embodiment of the power feeding system according to the present invention.

FIG. 4 is a table summarizing the operations of a switching control circuit and a switch in a second embodiment of the power feeding system according to the present invention.

FIG. 5 is a front view of a switch which is a third embodiment of the power feeding system according to the present invention.

FIG. 6 is a display example of a priority setting mode of a switch which is a third embodiment of the power feeding system according to the present invention.

FIG. 7 is a display example of operating states and power consumption of a switch which is a third embodiment of the power feeding system according to the present invention.

FIG. 8 is a display example of an operating state of a switch which is a third embodiment of the power feeding system according to the present invention.

FIG. 9 is a circuit configuration diagram showing a fourth embodiment of the power feeding system according to the present invention.

FIG. 10 is a circuit configuration diagram showing a fifth embodiment of the power feeding system according to the present invention.

[Explanation of symbols]

1-1, 1-2 ... AC power supply, 2-1, 2-2 ... Input-side switch, 3 ... Voltage detector, 4-1-4-n ... Output-side switch, 5
-1 to 5-n ... Load, 6 ... Power supply control device, 7 ... Switching control circuit, 8 ... Switch, 9 ... Uninterruptible power supply device, 10 ... Storage battery, 11 ... Power line, 12 ... Signal line, 13-1. 13-n
… Connector, 14… Photovoltaic power generator, 41… Lever, 4
2 ... Display panel, 43, 44 ... Selection key, 45 ... Enter key, 46 ... Mode switching key.

Claims (18)

[Claims] 1. A power supply system for supplying electric power to a load, wherein at least one input power source, a plurality of loads connected to the input power source, and a plurality of loads are respectively inserted between the input power source and the plurality of loads. Connected between the input power source and the plurality of switches, and a switch control device that generates a command to turn on and off the plurality of switches, and when the input power source has a power failure or voltage. It has an uninterruptible power supply that supplies power to any of the plurality of loads in the event of an abnormality, and presets the priority when turning on or off the plurality of switches when the input power source fails or when the voltage is abnormal. A power supply system characterized by being able to do. 2. The power supply system according to claim 1, wherein the switching control device is connected between the input power source and the plurality of switches, and the plurality of switches from the switching control device to the plurality of switches are connected. The transmission of the command to turn on / off the switch is performed by an electric signal superimposed on a power line between the switch control device and the plurality of switches. 3. The power supply system according to claim 2, wherein when a power failure or voltage abnormality occurs in one of the input power sources, the power failure or voltage abnormality of the input power source is detected to detect the other input power source or While switching to power supply from the uninterruptible power supply, only at least one switch having the lowest preset priority among the plurality of switches is turned off, and power is supplied only to a load connected to the switch. A power supply system characterized by stopping. 4. The power supply system according to claim 3, wherein a switch with a low priority is given when the state continues even after a lapse of a predetermined time after the occurrence of the power failure or the voltage abnormality. The power supply system is characterized by turning off in order. 5. The power supply system according to claim 3, wherein the switch is turned on when the state continues even after a lapse of a predetermined time after the occurrence of the power failure or the voltage abnormality. A power supply system, wherein a treatment for stopping the operation of a load connected to a switch in a state is performed, and after confirming that the operation of the load is stopped, the switch connected to the load is turned off. 6. The power supply system according to claim 3, wherein when the power failure or the abnormal voltage condition is resolved, the power supply is switched from the input power supply from which the power failure or abnormal voltage condition has been resolved, and the power is turned off. A power supply system characterized by turning the switch on again. 7. The power supply system according to claim 1, wherein when the total value of the power consumption of the load exceeds a predetermined capacity, the power of the uninterruptible power supply is simultaneously supplied to the load, A power supply system, characterized in that, of the switches, at least one switch having a low priority set in advance is turned off and only power supply to a load connected to the switch is stopped. 8. The power supply system according to claim 1, wherein at least one system of the input power supplies is a power supply device by solar power generation, and output power of the power supply device by solar power generation is below a predetermined value. In this case, the power of the uninterruptible power supply is simultaneously supplied to the load, and at least one of the plurality of switches having a low priority set in advance is turned off to be connected to the switch. A power supply system characterized by stopping only power supply to a load. 9. The power supply system according to claim 1, wherein the priority order when turning on or off the plurality of switches is different depending on a time zone. 10. The power supply system according to claim 1,
The plurality of switches are turned on or off by comparing a set value corresponding to a priority input in advance to each switch with a command value output from the switch control device. system. 11. The power supply system according to claim 10, wherein the switch operates to stop the operation of a load connected to the switch according to a command output from the switching control device. A power supply system having a function of changing the set value of the priority of the relevant switch to a lower value than before after confirming the stop. 12. The power supply system according to claim 10, wherein each of the plurality of switches is capable of arbitrarily setting a priority and has a function of displaying the set priority. Characteristic power supply system. 13. The power supply system according to claim 1, wherein when the input power supply has a plurality of systems, the input power supply is switched according to a power charge. 14. A power supply system for supplying electric power to a load, wherein at least one system of input power source, a plurality of loads connected to the input power source, and a plurality of loads inserted between the input power source and the plurality of loads, respectively. An uninterruptible power supply device that is connected between the input power supply and the plurality of switches, and that supplies power to any of the plurality of loads when the input power supply fails or a voltage is abnormal. And a power supply system for controlling ON or OFF of the plurality of switches according to an output waveform of the uninterruptible power supply. 15. The power supply system according to claim 1 or 14, wherein each of the plurality of switches is capable of setting a load type and displaying the set load type. A power supply system comprising: 16. The power supply system according to claim 1 or 14, wherein each of the plurality of switches has a function of displaying an operating state of the switch and a current power consumption of the load. Power supply system. 17. The power supply system according to claim 1 or 14, wherein each of the plurality of switches has a terminal for connecting a communication line for communicating with a load. 18. The power supply system according to claim 17, which has a function of constantly monitoring the states of the input power source and the load and predicting the future state, and outputting the estimated information from the terminal to the outside. A power supply system characterized by being possible.