JP2014057384A - Power supply system including electrical equipment - Google Patents

Abstract

An object of the present invention is to make an electric device recognize a power failure without requiring a communication line from an emergency power supply device.
An emergency power supply device 3 includes a storage battery 2, a power converter 5 that converts the power of the storage battery 2 into AC power, frequency detection means 10 that detects the frequency of a commercial power supply 1, and power conversion by detecting a power failure from the frequency. Power supply control means 12 for controlling the device 5, and the electric device 4 is operated in comparison with the frequency discriminating means 13 for discriminating the frequency supplied with power, the storage means 14 for storing the frequency, and the frequency stored in the supplied power. And a device control means 15 for controlling stoppage, the power supply control means 12 detects a power failure, supplies a frequency different from that of the commercial power supply 1 from the power converter 5, and the equipment control means 15 differs from the frequency of the storage means 14. In some cases, a power supply system including electrical equipment that eliminates the need for wiring for communication can be obtained by recognizing a power outage and minimizing load consumption.
[Selection] Figure 1

Description

  The present invention relates to a power supply system including an electric device that effectively uses electric power stored in a commercial power source or a power generation device during a power failure.

  In recent years, proposals have been made to store the power of a solar cell in a storage battery to supplement a part of the power consumption of an electric device, or to use it as a backup power source from a storage battery of an electric vehicle at the time of a power failure in a home during a disaster.

  In power outages over several hours, lighting, televisions, refrigerators, cooling and heating facilities are assumed as home lifelines, and effective use of power stored in storage batteries has become necessary.

  Conventionally, a power supply system including this type of electric device is known as an uninterruptible power supply for a server installed in a data center that effectively uses electric power stored in a storage battery in an electric device during a power outage (for example, Patent Documents). 1).

  The uninterruptible power supply will be described below with reference to FIG.

As shown in FIG. 4, an uninterruptible power supply 103 that stores the power of the commercial power supply 101 in a storage battery 102 and supplies the power to a load, and servers 104a to 104n that perform a plurality of information processing as the load are provided. A system,
The uninterruptible power supply 103 has a power converter 105 that converts the power of the commercial power supply 101 into a voltage suitable for the storage battery 102, a storage battery 102 that stores the converted power, and the stored power that is optimal for the servers 104a to 104n. The power converter 106 that converts the voltage into an appropriate voltage and outputs it, the power failure detection means 107 that detects a power failure of the commercial power supply 101, the communication means 108 that performs network communication, and the power failure detection means 107 in the event of a power failure 106 and control means 109 for controlling the communication means 108 are provided.

  On the other hand, the server 104 a includes a communication unit 110 that performs network communication and a control unit 111 that controls the data processing and the communication unit 110.

  The uninterruptible power supply 103 and the servers 104a to 104n are respectively connected to a power line 112 for supplying power and a communication line 113 for network communication.

  In the above configuration, when the control unit 109 of the uninterruptible power supply apparatus 103 detects a power failure of the commercial power supply 101 based on the information of the power failure detection unit 107, the communication unit 108 transmits the power failure information to the servers 104a to 104n through network communication.

  On the other hand, when the control unit 111 of the server 104a detects a power failure based on the information of the communication unit 110 from the network communication, the control unit 111 stops the data currently being processed in order to prevent the stored data from being damaged due to a power supply decrease during the data processing. By shifting to shutdown, the stored data can be safely stored before the power stored in the storage battery 102 can no longer be supplied.

  In addition, some power systems that include this type of electrical equipment forcibly stop the power supply of the load in order to effectively use the power stored in the storage battery at the time of a power failure without using a dedicated communication line. Yes (see, for example, Patent Document 2).

  The power supply system will be described below with reference to FIG.

  As shown in FIG. 5, a main power supply 121 that supplies power to a plurality of load devices 120a to 120n, a backup power supply 122, a voltage detection means 123 that monitors the voltage of the main power supply 121 and the backup power supply 122, and a load device 120a. To 120n, a first switching means 124 for switching the power supply to either the main power supply 121 or the backup power supply 122, a second switching means 125 for supplying individual power to the load devices 120a to 120n, a voltage The control unit 126 is configured to control the first switching unit 124 and the second switching unit 125 based on the information of the detection unit 123.

  The first switching means 124 supplies power to the load devices 120a to 120n through a contact a for supplying the power of the main power supply 121 and a contact b for supplying the power of the backup power supply 122.

  The second switching means 125 is provided with opening / closing devices 127a to 127n capable of opening / closing individual power supplies corresponding to the load devices 120a to 120n, and the control means 126 performs the opening / closing thereof.

  Furthermore, the switchgears 127a to 127n are connected in order of increasing power consumption of the load devices 120a to 120n.

  In the above configuration, the control means 126 is information from the voltage detection means 123. When the voltage of the main power supply 121 is below a certain level, the backup power supply 122 is switched by switching from the contact a to the contact b side of the first switching means 124. In accordance with the voltage drop level of the backup power supply 122, the power supply is stopped in the order of load devices with the higher power consumption of the switching devices 127a to 127n of the second switching means 125.

  Thus, the power supply stored in the storage battery can be maintained for a long time by stopping the power supply in the order of the load devices with higher power consumption.

  There is also PLC (Power Line Communications) technology, which is one of the power line communications that use the power line as a communication circuit, which communicates between devices connected to a dedicated electrical outlet by superimposing communication data on the commercial power supply. By using the adapter (PLC modem), a dedicated communication line becomes unnecessary.

JP 2005-18384 A JP 2000-156942 A

  In a power supply system including such a conventional electric device, a dedicated communication line is required for the electric device to be supplied with power in the event of a power failure to recognize the power failure or when there is no communication line, the electric device However, there was a problem that the power supply could be stopped without knowing the power failure state.

  Accordingly, the present invention solves the above-described conventional problems, and does not require a dedicated communication line on the side of the electric device that is supplied with power in the event of a power failure, and recognizes the power failure so that the electric device can continue to operate optimally. It aims at providing the power supply system containing this.

  In order to achieve this object, the present invention provides an emergency power supply apparatus that selects either one of a commercial power supply and an AC power supply obtained from a storage battery and supplies power to a load, and an electric device that is the load. The emergency power unit includes a storage battery that stores power from a commercial power source or an independent power generation device, a power converter that converts DC power stored in the storage battery into AC power, and Frequency detection means for detecting the frequency of the commercial power supply, power failure detection means for detecting a power failure of the commercial power supply from the detected frequency, and either AC power supplied to the electrical equipment is either a commercial power supply or an output of the power converter A switching means for switching to one of them, and a power supply control means for controlling the power converter when the power failure is detected. The frequency discriminating means for discriminating the frequency of the power supply, the storage means for storing the frequency discriminated by the frequency discriminating means in the initial stage, and the control of the operation and stop by comparing the frequency of the supplied power source with the stored frequency. And when the power failure detection means detects a power failure of the commercial power supply by the power failure detection means, the power converter outputs a frequency different from the frequency of the commercial power supply. And, when the switching means continues to supply power to the electrical equipment, the equipment control means of the electrical equipment, when the frequency determined by the frequency determination means is different from the frequency stored in the storage means, It is intended to minimize or stop the load consumption, thereby achieving the intended purpose.

  According to the present invention, there is provided a power supply system including an emergency power supply device that selects any one of a commercial power supply and an AC power supply obtained from a storage battery and supplies power to a load, and an electric device that is the load. The emergency power supply device has a storage battery for storing power from a commercial power supply or an independent power generation device, a power converter for converting DC power stored in the storage battery into AC power, and a frequency for detecting the frequency of the commercial power supply. A power failure detection means for detecting a power failure of a commercial power supply from the detected frequency, a switching means for switching the AC power supplied to the electrical equipment to either a commercial power supply or the output of the power converter, and a power failure A frequency determination unit that determines a frequency of a power source to be supplied with power to the electrical device, the switching unit and a power source control unit that controls the power converter. And a storage means for storing the frequency determined by the frequency determination means in the initial stage, and a device control means for controlling the operation and stop by comparing the frequency of the supplied power source with the stored frequency. The power control means of the emergency power supply device, when detecting a power failure of the commercial power supply by the power failure detection means, causes the power converter to output a frequency different from the frequency of the commercial power supply and the switching means to While continuing to supply power to the electrical equipment, the equipment control means of the electrical equipment minimizes load consumption when the frequency determined by the frequency determination means is different from the frequency stored in the storage means. When the commercial power supply fails due to the configuration of suppressing or stopping, the frequency of the commercial power supply is determined from the emergency power supply device. Supplies power of a different frequency to the electrical equipment, and the equipment control means of the electrical equipment can recognize that a power failure has occurred by supplying power different from the stored frequency. There is no need for dedicated wiring or wireless to notify power failure status other than power supply between the device and the electrical equipment, and expensive communication adapters (PLC modems) such as PLC are not required, and existing wiring and outlets can be used as they are. It is possible to notify the power outage status with low cost and low cost.

  In addition, by recognizing a power failure, the electrical device can effectively use the power of the storage battery stored at the time of commercial power failure by minimizing or stopping the consumption of its own load. Can do.

Configuration diagram of a power supply system including the electric apparatus according to the first embodiment of the present invention Configuration diagram of a power supply system including an electric device according to a second embodiment of the present invention Configuration diagram of a power supply system including an electric device according to a third embodiment of the present invention Configuration diagram of power supply system including conventional electrical equipment Configuration diagram of power supply system including conventional electrical equipment

  A power supply system including an electric device according to claim 1 of the present invention is an emergency power supply apparatus that selects either one of a commercial power supply and an AC power supply obtained from a storage battery and supplies power to the load, and the electricity that is the load. A power supply system comprising a device, wherein the emergency power supply device includes a storage battery that stores power from a commercial power supply or an independent power generation device, and a power converter that converts direct current power stored in the storage battery into alternating current power A frequency detection means for detecting the frequency of the commercial power supply, a power failure detection means for detecting a power failure of the commercial power supply from the detected frequency, and an AC power supplied to the electrical device as an output of the commercial power supply or the power converter A switching means for switching to any one of the above, and a power supply control means for controlling the power converter when the power failure is detected. A frequency discriminating unit for discriminating the frequency of the power source to be operated, a storage unit for storing the frequency discriminated by the frequency discriminating unit in the initial stage, and comparing the frequency of the supplied power source with the stored frequency to Device control means for performing control, and when the power supply control means of the emergency power supply device detects a power failure of the commercial power supply by the power failure detection means, the power converter has a frequency different from the frequency of the commercial power supply. And when the switching means continues to supply power to the electrical equipment, the equipment control means of the electrical equipment has a frequency determined by the frequency determination means different from the frequency stored in the storage means In addition, the load consumption is minimized or stopped.

  As a result, when the commercial power supply fails, the emergency power supply device supplies power of a frequency different from the frequency of the commercial power supply to the electrical device, and the device control means of the electrical device is stored in the storage means. It is possible to recognize that a power failure has occurred by supplying power different from the stored frequency, so there is no need for a dedicated wiring or radio between the emergency power supply and the electrical device to notify the power failure status other than power supply. In addition, an expensive communication adapter (PLC modem) such as a PLC is not required, and it is possible to notify a power failure state at a low cost and with a reduced construction that allows existing wiring and outlets to be used as they are.

  In addition, the electric device recognizes a power failure, thereby minimizing or stopping the consumption of its own load, thereby effectively using the power of the storage battery stored at the time of the power failure of the commercial power supply.

  Moreover, the power supply system including the electric device according to claim 2 includes battery capacity detection means for determining the storage amount of the storage battery in the power supply control means, and when the power failure detection means detects a power failure of the commercial power supply, The power supply control means causes the power converter to output a frequency different from the frequency of the commercial power supply when the charged amount is reduced below a predetermined amount, and outputs the frequency at the frequency of the commercial power supply when not reduced. You may make it the structure of making it do.

  As a result, when the commercial power supply fails, the amount of power stored in the storage battery can be reduced to a predetermined level by reducing the balance between the power supply from the power generation device and the power consumption of the electric device, or the power consumption of the electric device being small. If the power does not drop below the amount, the emergency power supply supplies the electric equipment with the same frequency as that of the commercial power supply, and the equipment control means of the electric equipment supplies the same power as the stored frequency. As a result, it is possible to keep the load state without recognizing a power outage without minimizing the consumption of its own load or without stopping.

  Thus, when the electric power supply from the power generation device does not reduce the amount of stored electricity to a predetermined level, the electric power stored in the storage battery can be effectively used while maintaining the operation of the electric device.

  A power supply system including the electrical device according to claim 3, wherein the power converter that converts DC power stored in the storage battery into AC power having a plurality of stages of frequencies different from the frequency of the commercial power source, and the electrical device Comprises the frequency discriminating means capable of discriminating the frequencies of the plurality of stages, and the power supply control means that detects a power failure from the power converter according to the amount of charge of the battery capacity detecting means for judging the amount of charge of the storage battery By changing the frequency of the power supply stepwise, the electric device may be configured to suppress or stop the load consumption stepwise according to the frequency of the power supply.

  As a result, when the commercial power supply fails, the electrical equipment can also estimate the state of the amount of electricity stored in the storage battery from the emergency power supply device, and stage the consumption of self-confidence according to the state of the amount of electricity stored Therefore, the power stored in the storage battery can be effectively used while maintaining the convenience of the user as much as possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, an emergency power supply device 3 that selects any one of an AC power source obtained from a commercial power source 1 and a storage battery 2 and supplies power to a load, and a plurality of electric devices 4 that are the loads are provided. Power system.

  In the description of the embodiment, when each of the electric devices 4 is shown separately, the electric devices 4a to 4n are expressed using alphabets.

  The emergency power supply device 3 connected to the commercial power source 1 includes a power converter 5 that converts DC power stored in the storage battery 2 into AC power, and AC power supplied to the electrical equipment 4 to the commercial power source or the power converter 5. Switching means 6 for switching to either one of the outputs is provided.

  The emergency power supply device 3 is connected to a power generation device 7 typified by a solar power generation device, and includes a circuit that stores DC power in the storage battery 2.

  That is, an AC-DC converter 8 connected to the commercial power source 1 connected to the emergency power supply 3 and a DC-DC converter 9 connected to the power generator 7 are provided.

  This AC-DC conversion means 8 converts electric power obtained from the commercial power source 1 into a DC voltage corresponding to the storage voltage of the storage battery 2.

  The DC-DC converter 9 converts the DC voltage supplied from the power generator 7 into a DC voltage corresponding to the storage voltage of the storage battery 2.

  That is, the storage battery 2 is connected to the AC-DC converting means 8 or the DC-DC converting means 9 and stores the power of the commercial power source 1 or the independent power generator 7.

  Further, the emergency power supply device 3 includes a circuit that supplies the electric power of the commercial power supply 1 to the electric device 4 as it is, and a circuit that supplies the output of the power converter 5 to the electric device 4.

  The switching means 6 includes a contact a for supplying the electric power of the commercial power source 1 to the electric device 4 and a contact b for supplying the electric power stored in the storage battery 2 from the power converter 5 to the electric device 4.

  Further, the emergency power supply device 3 includes frequency detection means 10 for detecting the frequency of the commercial power supply 1, power failure detection means 11 for detecting a power failure of the commercial power supply 1 from the detected frequency, and the power failure detection signal, The switching means 6 and the power supply control means 12 which controls the power converter 5 are provided.

  The switching unit 6 receives a signal from the power supply control unit 12 and switches to a circuit that supplies the output of the power converter 5 to the electric device 4.

  When the power converter 5 receives a signal from the power control means 12, it converts the DC power stored in the storage battery 2 into AC power. In this case, the frequency of the output AC power is set by the signal from the power control means 12. Is.

  When the power supply control means 12 receives the power failure detection signal from the power failure detection means 11, the power supply control means 12 switches the switching means 6 from the contact a side to the contact b side that supplies the output of the power converter 5 to the electrical device 4, and commercial power A command signal having an output frequency different from the frequency of 1 is output to the power converter 5.

  The output frequency from the power converter 5 is set in advance.

  Desirably, the output frequency includes the frequency tolerance of the commercial power source 1 within ± 1 Hz, the accuracy of the output frequency of the power converter 5 and the detection error of the frequency discriminating means 13 for discriminating the frequency of the electric device 4. The output frequency in the range of 3 Hz to 10 Hz is better than the frequency of the commercial power source 1.

  Specifically, when the commercial power source 1 is 50 Hz, a frequency of 60 Hz is output.

  On the other hand, the electrical device 4 includes a frequency discriminating unit 13 that discriminates the frequency of the power source to which power is supplied, a storage unit 14 that stores the frequency discriminated by the frequency discriminating unit 13 in the initial stage, and the frequency of the supplied power source. It has a configuration provided with device control means 15 that controls operation and stop by comparing the stored frequency.

  In addition, the device control unit 15 always obtains information on the frequency of the power source supplied from the frequency discrimination unit 13 being 50 Hz or 60 Hz, and stores the information on the frequency of the power source supplied by initial energization in the storage unit 14. I am letting.

  And the apparatus control means 15 always compares the frequency information memorize | stored in the memory | storage means 14, and the information of the frequency discrimination means 13, and when the compared frequency information differs, the commercial power source 1 will be cut off and the electric power from the storage battery 2 will be shown. Judge that supply is being made.

  In the above-described configuration, the emergency power supply device 3 stores AC power in the storage battery 2 by converting AC power into DC power by the AC-DC conversion means 8 connected to the commercial power source 1.

  And when the power supply control means 12 receives the information that no power failure is detected by the power failure detection means 11 from the frequency information of the frequency detection means 10 that detects the frequency of the commercial power supply 1, it is set to the contact a side of the switching means 6. The electric power of the commercial power source 1 is supplied to the electric device 4.

  Then, when the commercial power source 1 has a power failure, the power source control unit 12 switches from the frequency information of the frequency detection unit 10 to the contact point b side of the switching unit 6 upon receiving information that the power failure has been detected by the power failure detection unit 11. A signal indicating an output frequency having a frequency different from the frequency of the commercial power supply 1 is sent to the power converter 5.

  The power converter 5 receives the signal, changes the direct-current power stored in the storage battery 2 to power having a frequency different from the frequency of the commercial power supply 1, and continues to supply to the electric device 4.

  Further, in the electrical device 4, the device control means 15 recognizes that the compared frequency information is different from the frequency information of the power supplied from the frequency discrimination means 13 and the frequency stored in the storage means 14. Then, it is determined that the commercial power source 1 is cut off and power is supplied from the storage battery 2, and the consumption of its own load is minimized or stopped.

  As a specific example of the electric device 4 at the time of the power failure, the electric device 4a (for example, an air conditioner) and the electric device 4b (for example, a refrigerator) are relatively important as lifelines having relatively high importance. It is possible to determine the operation at the time of a power failure by distinguishing the electrical devices 4c (for example, a fan) and the electrical devices 4d (for example, a ventilation fan) as low ones.

  In other words, in the event of a power outage, household lifeline electrical devices such as air conditioners and refrigerators continue to operate while reducing power consumption by reducing their ability to operate, and fans and ventilation fans are stopped, and the power consumption of storage batteries Can be reduced.

  As described above, in the power supply system including the electric device according to the present embodiment, no dedicated wiring or radio for notifying the power failure state other than the power supply between the emergency power supply device 3 and the electric device 4 is required. Such an expensive communication adapter (PLC modem) is also unnecessary, and it is possible to notify the power failure state at a low cost and with a reduced construction that allows existing wiring and outlets to be used as they are.

  In addition, the electric device 4 can effectively use the power of the storage battery 2 stored at the time of the power failure of the commercial power source 1 by recognizing the power failure to minimize or stop the consumption of its own load.

  The power failure detection means 11 detects the power failure by the frequency information from the frequency detection means 10 and causes the power supply control means 12 to recognize the power failure. However, in the case of the power supply control means 12 using a microcomputer, the frequency detection means 10 Even if a power failure is recognized directly from frequency information, there is no difference in its effect.

  Although the device control means 15 stores the information of the power supply frequency at the initial energization in the storage means 14, even if the storage frequency is rewritten when the initial energization has passed for several hours, there is no difference in the effect.

(Embodiment 2)
In FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The power supply control means 16 of this embodiment has a configuration in which a battery capacity detection means 17 for determining the amount of charge of the storage battery 2 is provided with respect to the power supply control means 12 of the first embodiment.

  Then, the power supply control means 16 determines whether or not the charged amount has decreased to a predetermined charged amount and outputs a signal indicating the output frequency of the power converter 5.

  In the above configuration, when the commercial power source 1 fails, the balance between the power supply from the power generation device 7 (for example, the operation of the daytime solar power generation device) and the power consumption of the electric device 4 or the power consumption of the electric device 4 is small. When the power storage amount stored in the storage battery 2 does not drop below the predetermined power storage amount, the power supply control means 16 determines that the predetermined power storage amount is secured by the information of the battery capacity detection means 17, The power converter 5 continues to supply the electric device 4 with power having the same frequency as that of the commercial power supply 1.

  And the apparatus control means 15 of the electric equipment 4 continues operation | movement, without recognizing a power failure by having supplied the same electric power as the memorized frequency.

  On the other hand, when the amount of power stored in the storage battery 2 is reduced to a predetermined amount or less due to a power failure of the commercial power source 1, the emergency power supply device 3 supplies electric power with a frequency different from the frequency of the commercial power source 1. The device control means 15 of the electric device 4 recognizes a power failure and minimizes or stops the consumption of its own load because the power supply different from the stored frequency is supplied.

  As described above, when the electric power supply from the power generation device 7 does not reduce the predetermined amount of stored electricity, the electric power stored in the storage battery 2 can be effectively used while maintaining the operation of the electric device 4.

(Embodiment 3)
In FIG. 3, the same components as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  The emergency power supply device 3 of the present embodiment is different from that of the second embodiment in that the power control means 19 outputs a frequency command signal to the power converter 18 in a multistage manner according to the amount of power stored in the storage battery 2, and The difference is that it includes a power converter 18 that converts DC power stored in the storage battery 2 into AC power having a plurality of frequencies different from the frequency of the commercial power supply 1.

  That is, the power supply control means 19 changes the command signal of the frequency of the power supply to the power converter 18 in a stepwise manner in accordance with the storage amount of the storage battery 2 detected by the battery capacity detection means 17.

  For example, the frequency is switched to three stages, and when the frequency of the commercial power source 1 is 50 Hz, the output is 53, 56, 60 Hz, depending on how the amount of stored power is reduced.

  In addition, the electrical device 4 is compared with the frequency determining unit 13 according to the first embodiment with respect to the frequency determining unit 20 that determines the frequencies of the plurality of stages and the device control unit 15 according to the first embodiment. It has the structure which provided the apparatus control means 21 which adjusts the control amount of load according to a frequency.

  The frequency discriminating means 20 detects the frequency of the power supply by distinguishing it into a plurality of stages.

  The device control means 21 controls the electric device 4 by associating the supplied power frequency with the control amount of the load.

  In this embodiment, when the frequency is set in three stages and the frequency of the commercial power source 1 is 50 Hz, the device control means 21 of the electric device 4 suppresses load consumption as the frequency approaches 53, 56, 60 Hz, and 60 Hz. Or it is to stop.

  In the above configuration, the power supply control means 19 that detects a power failure outputs an output frequency command signal to the power converter 18 in accordance with the amount of power stored in the battery capacity detection means 17 that detects the amount of power stored in the storage battery 2. .

  As a result, the power converter 18 changes the frequency of the power supply stepwise.

  On the other hand, the device control means 21 of the electric device 4 determines the frequency of the power supply by the frequency determination means 20, and suppresses or stops the load consumption step by step according to the frequency of the power supply.

  Such an electric device 4 is an electric device provided with notch switching by an inverter device such as an air conditioner or a fan motor.

  As a result, when the commercial power source 1 fails, the electric device 4 can also estimate the state of the amount of electricity stored in the storage battery 2 from the emergency power supply device 3, and stage the consumption of the load of confidence according to the state of the amount of electricity stored. Therefore, the power stored in the storage battery 2 can be used effectively while maintaining the convenience of the user as much as possible.

  The power supply system including the electric device according to the present invention eliminates the need for a dedicated wiring that notifies a power failure state other than power supply between the emergency power supply and the electric device, and an expensive communication adapter such as a wireless or PLC, The existing power supply and outlet can be used as they are, and the power failure status can be notified at low cost and the power of the storage battery stored during the power failure can be used effectively. It is useful as a power supply system including an electric device that effectively uses electric power stored in a power generation device.

DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Storage battery 3 Emergency power supply device 4 Electrical equipment 4a-4n Electrical equipment 5 Power converter 6 Switching means 10 Frequency detection means 11 Power failure detection means 12 Power supply control means 13 Frequency discrimination means 14 Storage means 15 Equipment control means 16 Power supply Control means 17 Battery capacity detection means 18 Power converter 19 Power supply control means 20 Frequency discrimination means 21 Device control means

Claims (3)

A power supply system comprising: an emergency power supply device that selects one of a commercial power supply and an AC power supply obtained from a storage battery and supplies power to a load; and the electrical equipment that is the load, the emergency power supply device A storage battery for storing the power of a commercial power supply or an independent power generation device, a power converter for converting DC power stored in the storage battery into AC power, a frequency detection means for detecting the frequency of the commercial power supply, When a power failure is detected, a power failure detection means for detecting a power failure of the commercial power supply from the detected frequency, a switching means for switching the AC power supplied to the electrical equipment to either the commercial power supply or the output of the power converter, and And a switching means and a power control means for controlling the power converter, and the electrical equipment includes a frequency discrimination means for discriminating a frequency of a power source to be supplied with power, and initially Storage means for storing the frequency determined by the frequency determination means, and device control means for performing control of operation and stop by comparing the frequency of the supplied power source with the stored frequency. The power supply control means of the power supply device outputs a frequency different from the frequency of the commercial power supply from the power converter when the power failure detection means detects the power failure of the commercial power supply, and the switching means powers the electric equipment. And the device control means of the electrical equipment minimizes or stops load consumption when the frequency determined by the frequency determination means is different from the frequency stored in the storage means. A power supply system including an electrical device. The power supply control means includes battery capacity detection means for determining a storage amount of the storage battery, and when the power failure detection means detects a power failure of a commercial power supply, the power supply control means is configured such that the storage amount is equal to or less than a predetermined amount. 2. The electric device according to claim 1, wherein a frequency different from the frequency of the commercial power source is output from the power converter when the frequency is reduced, and an output is performed at the frequency of the commercial power source when the frequency is not reduced. Including power system. The power converter for converting the DC power stored in the storage battery into AC power of a plurality of stages different from the frequency of the commercial power supply; and the frequency discrimination means capable of discriminating the plurality of stages of frequency in the electrical device; The power control means that has detected a power outage stepwise changes the frequency of the power source from the power converter in accordance with the amount of power stored in the battery capacity detecting means for determining the amount of power stored in the storage battery, The power supply system including an electric device according to claim 1, wherein the device suppresses or stops load consumption in a stepwise manner according to the frequency of the power supply.

Images