JP2009148070A - Power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To store electric charge required when a disaster occurs into a secondary cell while preventing the secondary cell from being overcharged or overdischarged. <P>SOLUTION: A distributed power supply 20 for supplying electric power to a DC apparatus 102 when a main power supply 10 stops includes the secondary cell 162. The secondary cell 162 is charged by a charge controller 13 in a steady state where the main power supply 10 is in operation. A home server 116 includes a disaster forecast acquisition portion 14 for acquiring a forecast of a disaster where stop of the main power supply 10 is predicted. The charge controller 13 does not fully charge the secondary cell 162 and, when the disaster forecast acquisition portion 14 acquires a disaster forecast, quickly charges the secondary cell 162 to increase the amount of charge stored therein compared with at a steady state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a backup of power supply when a power supply is provided to a device arranged in a building such as a house, a store, an office, etc., in addition to a main power source such as a commercial power source, provided with a secondary battery. The present invention relates to a power supply system provided with a distributed power source for performing the above.

Generally, as a power supply system of this type, the secondary battery for backup is charged using the power of the main power supply in the steady state when the main power supply such as a commercial power supply has not failed. The thing of the structure which backs up a power supply using the electric power of a secondary battery is known (for example, refer patent document 1). Rechargeable secondary battery is charged when the main power supply is not interrupted, and the more charge stored in the secondary battery, the more power that can be supplied during a power failure. Therefore, in general, the amount of electricity stored in the secondary battery is controlled to be the amount of charge when fully charged.
JP 2001-103679 A

  However, if the secondary battery is always kept fully charged, there is a risk of overcharging. In particular, when a lithium ion battery is used as a secondary battery, both overcharge and overdischarge cause failure, and it becomes impossible to secure backup power when the main power fails. Charging and overdischarge must be avoided.

  In order to avoid the occurrence of such a problem, it is conceivable that the target value of the charged amount of the secondary battery charged by the main power source is made smaller than the charge amount at the time of full charge. However, when the amount of electric charge stored in the secondary battery is small, there arises a problem that the number of units and the time in which the device can be operated during a power failure of the main power supply is shortened. If a secondary battery with a sufficiently large charge amount can be used, restrictions on the number of operating devices and operation time can be relaxed even with a smaller charge amount than when fully charged. The secondary battery is expensive and has a problem of large volume and large size.

  The present invention has been made in view of the above reasons, and its purpose is to always reduce the amount of electric charge stored in the secondary battery to prevent the failure of the secondary battery, and to prevent the power supply by the secondary battery. To provide a power supply system that enables operation of a device for a relatively long period of time by increasing the amount of power stored in a secondary battery at the time of a disaster that requires backup and the backup period is expected to be prolonged. .

  The invention of claim 1 includes a power supply unit including a secondary battery and a distributed power source that can back up power supply when the main power supply is stopped, and a device that is arranged in a building and driven by power supplied from the power supply unit A charge control unit that charges the secondary battery, and a disaster forecast acquisition unit that acquires a forecast of occurrence of a disaster that is expected to stop the main power supply. The amount of charge stored in the secondary battery after obtaining the value is increased from the steady state.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the disaster forecast acquisition unit acquires a fire occurrence forecast obtained from an output of a fire detector installed in a building in which equipment is arranged. And

  According to a third aspect of the present invention, in the first aspect of the invention, the disaster forecast acquisition unit acquires an earthquake occurrence forecast.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the disaster forecast acquisition unit acquires a typhoon approach forecast.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the charge control unit is configured to determine a charge amount stored in the secondary battery in a steady state when the main power supply is not stopped. A target charge amount that does not fall below a charge amount necessary for a predetermined device among the devices to continue operation for a predetermined time is set, and charge control is performed so as not to fall below the target charge amount.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the charge control unit determines the extent to which the upper limit of the amount of charge that can be stored in the secondary battery has decreased from the initial time as the evaluation of the deterioration of the secondary battery. It is characterized by comprising deterioration evaluation means obtained at a steady time when the power supply is not stopped, and target setting means for increasing the target charge amount as the degree of deterioration obtained by the deterioration evaluation means is larger.

  According to a seventh aspect of the invention, in any one of the first to sixth aspects of the invention, the power supply unit supplies direct current power, and the device is a direct current device driven by direct current power. .

  According to the configuration of the first aspect of the invention, when the occurrence forecast of the disaster is acquired, the charge control is performed so that the amount of charge stored in the secondary battery is increased from that in the normal state. It is possible to reduce the amount of charge to be made less than when fully charged, thereby reducing the possibility of overcharging. On the other hand, when a disaster occurrence forecast is acquired, the amount of charge stored in the secondary battery is increased compared to the steady state, so in the event of a disaster where the power backup period is expected to be prolonged, Operation of equipment over a long period of time can be enabled.

  In the inventions of claims 2 to 4, the type of disaster acquired by the disaster forecast acquisition unit is specified, and when a fire occurrence forecast is acquired from the output of a fire detector installed in a building, the occurrence of an earthquake When the forecast is acquired, the storage amount of the secondary battery is increased each time the typhoon approach forecast is acquired, so it is necessary to secure power to lighting equipment on the evacuation route and information equipment required for reporting Can do.

  According to the configuration of the invention of claim 5, since the secondary battery is charged so that the predetermined device does not fall below the amount of charge necessary to continue the operation for the predetermined time, the main power source is not caused by a disaster. Necessary equipment can be continuously operated even when the power supply is stopped (for example, when there is an instantaneous power failure of the commercial power supply).

  According to the configuration of the sixth aspect of the invention, the secondary battery is evaluated by evaluating the degree of deterioration of the secondary battery and increasing the amount of charge supplied to the secondary battery in the steady state as the deterioration of the secondary battery progresses. It is possible to secure the amount of charge stored in the. In other words, even if the secondary battery deteriorates and the upper limit of the storage amount decreases, the storage amount does not decrease in the secondary battery in the steady state, and the default device continues to operate for the predetermined time when the main power supply is stopped. Therefore, it is possible to secure a necessary charge amount.

  According to the configuration of the invention of claim 7, since the device is a direct current, when using a secondary battery as a distributed power source, there is no need to convert it into alternating current power, and the distributed power source only needs to control the output voltage, The configuration of the distributed power supply is simplified.

  Although the embodiment described below is described assuming a detached house as a building to which the present invention is applied, it does not preclude applying the technical idea of the present invention to an apartment house. FIG. 4 shows the overall configuration of a power supply system to which this embodiment is applied. As shown in FIG. 4, the house H is provided with a DC power supply unit (power supply unit) 101 that outputs DC power and a DC device (equipment) 102 as a load driven by the DC power. DC power is supplied to the DC device 102 through the DC supply line Wdc connected to the output end of the power supply unit 101. A current flowing through the DC supply line Wdc is monitored between the DC power supply unit 101 and the DC device 102. When an abnormality is detected, power is supplied from the DC power supply unit 101 to the DC device 102 on the DC supply line Wdc. A DC breaker 114 is provided for limiting or blocking the current.

  The DC supply line Wdc is used as both a DC power supply path and a communication path, and is connected to the DC supply line Wdc by superimposing a communication signal for transmitting data on a DC voltage using a high-frequency carrier wave. Enables communication between devices. This technique is similar to a power line carrier technique in which a communication signal is superimposed on an AC voltage in a power line that supplies AC power.

  The DC supply line Wdc is connected to the home server 116 via the DC power supply unit 101. The in-home server 116 is a main device for constructing a home communication network (hereinafter referred to as “home network”), and communicates with a subsystem constructed by the DC device 102 in the home network.

  In the example shown in the drawing, as an subsystem, an illumination system comprising an information equipment system K101 comprising an information-system DC device 102 such as a personal computer, a wireless access point, a router, and an IP telephone, and an illumination system DC equipment 102 such as a lighting fixture. K102, K105, entrance system K103 composed of DC device 102 for dealing with visitors, monitoring intruders, etc., and residential alarm system K104 composed of alarm DC device 102 such as a fire detector. Each subsystem constitutes a self-supporting distributed system, and can operate even with the subsystem alone.

  The above-described DC breaker 114 is provided in association with a subsystem. In the illustrated example, four DCs are associated with the information equipment system K101, the lighting system K102 and the entrance system K103, the house alarm system K104, and the lighting system K105. A breaker 114 is provided. When a plurality of subsystems are associated with one DC breaker 114, a connection box 121 for dividing the system of the DC supply line Wdc is provided for each subsystem. In the illustrated example, a connection box 121 is provided between the illumination system K102 and the entrance system K103.

  As the information equipment system K101, there is provided an information equipment system K101 composed of a DC equipment 102 connected to a DC outlet 131 arranged in advance in the house H (constructed when the house H is constructed) in the form of a wall outlet or a floor outlet.

  The lighting systems K102 and K105 include a lighting system K102 composed of a lighting device (DC device 102) arranged in advance in the house H and a lighting device (DC device 102) connected to a hook ceiling 132 arranged in advance on the ceiling. An illumination system K105 is provided. At the time of interior construction of the house H, the contractor attaches the lighting fixture to the hook ceiling 132, or the householder himself attaches the lighting fixture.

  In addition to using an infrared remote control device, a control instruction for the lighting apparatus that is the DC device 102 constituting the lighting system K102 can be given using a communication signal from the switch 141 connected to the DC supply line Wdc. That is, the switch 141 has a communication function together with the DC device 102. In addition, a control instruction may be given by a communication signal from another DC device 102 in the home network or the home server 116 regardless of the operation of the switch 141. The instructions to the lighting fixture include lighting, extinguishing, dimming, and blinking lighting.

  Since any DC device 102 can be connected to the DC outlet 131 and the hooking ceiling 132 described above and DC power is output to the connected DC device 102, the DC outlet 131 and the hooking ceiling 132 are distinguished below. When it is not necessary, it is called “DC outlet”.

  These DC outlets have a plug-in connection port into which a contact (not shown) provided directly on the DC device 102 or a contact (not shown) provided via a connection line is inserted into the body. The contact receiver that directly contacts the contact inserted into the connection port is held by the container. That is, the direct current outlet supplies power in a contact manner. When the DC device 102 connected to the DC outlet has a communication function, a communication signal can be transmitted through the DC supply line Wdc. A communication function is provided not only in the DC device 102 but also in the DC outlet.

  The home server 116 not only is connected to the home network, but also has a connection port connected to the wide area network NT that constructs the Internet. When the in-home server 116 is connected to the wide area network NT, it is possible to receive services from the center server 200 that is a computer server connected to the wide area network NT.

  The service provided by the center server 200 includes a service that enables monitoring and control of equipment (including mainly the DC equipment 102 but also other equipment having a communication function) connected to the home network through the wide area network NT. is there. This service makes it possible to monitor and control devices connected to the home network using a communication terminal (not shown) having a browser function such as a personal computer, Internet TV, or mobile phone.

  The in-home server 116 has both functions of communication with the center server 200 connected to the wide area network NT and communication with equipment connected to the home network, and identification information about equipment in the home network ( Here, it is assumed that an IP address is used).

  The home server 116 enables monitoring and control of home devices through the center server 200 from a communication terminal connected to the wide area network NT by using a communication function with the center server 200. The center server 200 mediates between home devices and communication terminals on the wide area network NT.

  When monitoring and controlling home devices from a communication terminal, monitoring and control requests are stored in the center server 200, and the home device periodically performs one-way polling communication to monitor from the communication terminal. And receive control requests. With this operation, it is possible to monitor and control devices in the house from the communication terminal.

  Further, when an event that should be notified to the communication terminal, such as a fire detection, occurs in the home device, the home device notifies the center server 200, and the center server 200 notifies the communication terminal by e-mail.

  An important function among the communication functions with the home network in the home server 116 is the detection and management of devices constituting the home network. The home server 116 automatically detects devices connected to the home network by applying UPnP (Universal Plug and Play). The home server 116 includes a display device 117 having a browser function, and displays a list of detected devices on the display device 117. The display device 117 has a configuration with a touch panel type or an operation unit, and can perform an operation of selecting desired contents from options displayed on the screen of the display device 117. Therefore, the user (contractor or householder) of the home server 116 can monitor or control the device on the screen of the display device 117. The display device 117 may be provided separately from the home server 116.

  The in-home server 116 manages information related to device connection, and grasps the type, function, and address of the device connected to the home network. Accordingly, the devices in the home network can be operated in conjunction with each other. Information on the connection of the device is automatically detected as described above. In order to operate the device in an interlocking manner, the device itself is automatically associated with the attribute held by the device itself, and the home server 116 is configured as a personal computer. It is also possible to connect various information terminals and use the browser function of the information terminals to associate devices.

  Each device holds the relationship of the interlocking operation of the devices. Therefore, the device can operate in an interlocked manner without passing through the home server 116. By associating the linked operations for each device, for example, by operating a switch that is a device, it is possible to turn on or off the lighting fixture that is the device. In many cases, the association of the interlocking operations is performed within the subsystem, but the association beyond the subsystem is also possible.

  By the way, the DC power supply unit 101 basically generates DC power by power conversion of an AC power supply AC supplied from outside the house like a commercial power supply. In the configuration shown in the figure, the AC power source AC is input to an AC / DC converter 112 including a switching power source through a main circuit breaker 111 attached to the distribution board 110 as an internal unit. The DC power output from the AC / DC converter 112 is connected to each DC breaker 114 through the cooperative control unit 113.

  The DC power supply unit 101 is provided with a secondary battery 162 in preparation for a period in which power is not supplied from the AC power supply AC (for example, a power failure period of the commercial power supply AC). It is also possible to use a solar cell 161 or a fuel cell 163 that generates DC power. The solar battery 161, the secondary battery 162, and the fuel battery 163 are distributed power supplies with respect to the main power supply including the AC / DC converter 112 that generates DC power from the AC power supply AC. In the illustrated example, the solar cell 161, the secondary battery 162, and the fuel cell 163 include a circuit unit that controls the output voltage, and the secondary battery 162 includes a circuit unit that controls charging as well as discharging.

  Of the distributed power sources, the solar cell 161 and the fuel cell 163 are not necessarily provided, but the secondary battery 162 is preferably provided. The secondary battery 162 is charged in a timely manner by a main power source or other distributed power source, and the secondary battery 162 is discharged not only in a period in which power is not supplied from the AC power source AC but also in a timely manner as necessary. The cooperation control unit 113 performs charge / discharge of the secondary battery 162 and cooperation between the main power source and the distributed power source. That is, the cooperative control unit 113 functions as a DC power control unit that controls the distribution of power from the main power supply and the distributed power supply constituting the DC power supply unit 101 to the DC devices 102. Note that a configuration may be adopted in which the outputs of the solar cell 161, the secondary battery 162, and the fuel cell 163 are converted into AC power and used as input power of the AC / DC converter 112.

  Since the driving voltage of the DC device 102 is selected from a plurality of types of voltages depending on the device, the cooperative control unit 113 is provided with a DC / DC converter to convert the DC voltage obtained from the main power source and the distributed power source into the necessary voltage. Is desirable. Normally, one type of voltage is supplied to one subsystem (or DC device 102 connected to one DC breaker 114), but three or more wires are used for one subsystem. A plurality of types of voltages may be supplied. Alternatively, it is possible to adopt a configuration in which the DC supply line Wdc is of a two-wire type and the voltage applied between the lines is changed with time. The DC / DC converter may be provided in a plurality of dispersed manners like the DC breaker.

  In the above configuration example, only one AC / DC converter 112 is illustrated, but a plurality of AC / DC converters 112 can be arranged in parallel, and when a plurality of AC / DC converters 112 are provided. It is desirable to increase or decrease the number of AC / DC converters 112 that are operated according to the magnitude of the load.

  The AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, the solar cell 161, the secondary battery 162, and the fuel cell 163 described above are provided with a communication function, and include a main power source, a distributed power source, and a DC device 102. It is possible to perform cooperative operations that deal with the load status. The communication signal used for this communication is transmitted in the form of being superimposed on the DC voltage in the same manner as the communication signal used for the DC device 2.

  In the above example, the AC / DC converter 112 is arranged in the distribution board 110 in order to convert the AC power output from the main breaker 111 into DC power by the AC / DC converter 112. On the output side, a branch breaker (not shown) provided in the distribution board 110 branches the AC supply line into a plurality of systems, and an AC / DC converter is provided on the AC supply line of each system to convert it into DC power for each system. You may employ | adopt the structure to do.

  In this case, since the DC power supply unit 101 can be provided for each floor or room of the house H, the DC power supply unit 101 can be managed for each system, and the DC device 102 that uses DC power and Since the distance of the DC supply line Wdc between the two is reduced, the power loss due to the voltage drop in the DC supply line Wdc can be reduced. Also, the main breaker 111 and the branch breaker are housed in the distribution board 110, and the AC / DC converter 112, the cooperative control unit 113, the DC breaker 114, and the home server 116 are housed in a separate board from the distribution board 110. Also good.

  Below, the principal part of this embodiment is demonstrated with reference to FIG. In FIG. 1, a solid line indicates a power supply path, and a broken line indicates a communication path. As described above, the communication signal is superimposed on the DC voltage, but a communication path for transmitting the communication signal may be provided separately from the DC supply line Wdc. The direct-current power supply unit 101 includes a main power supply 10 including an AC / DC converter 112 and an alternating-current power supply AC, and a distributed power supply 20 including at least the secondary battery 162 among the solar battery 161, the secondary battery 162, and the fuel cell 163. With.

  In the illustrated example, the DC power supply unit 101 includes a power failure detection unit 11 that detects a stop of the main power source 10 (power failure or abnormal decrease in line voltage), a main power source 10, a distributed power source 20, and a DC supply line Wdc. And a power supply control unit 12 that performs the connection. Further, a charging control unit 13 that controls a charging current to the secondary battery 162 provided in the distributed power source 20 is provided. The power failure detection unit 11 and the power supply control unit 12 may be provided separately from the DC power supply unit 101. When the power failure detection unit 11 detects that the main power supply 10 is stopped, the power supply control unit 12 disconnects the main power supply 10 from the DC supply line Wdc and connects only the distributed power supply 20 to the DC supply line Wdc. With this configuration, backup by the distributed power source 20 is possible when the main power source 10 is stopped. The power failure detection unit 11, the power supply control unit 12, and the charge control unit 13 are provided in the cooperative control unit 113.

  On the other hand, the home server 116 can communicate with the fire detector as the DC device 102 included in the residential alarm system K104 as described above, and can acquire information from various servers through the wide area network NT. Important information in the present embodiment is information on disasters in which the main power supply 10 is expected to stop, and for these disasters, a fire occurrence forecast (such as an increase in smoke concentration) obtained from the output of the fire detector, It has become possible to acquire information on occurrence forecasts such as earthquake occurrence forecasts and approach forecasts based on typhoon course predictions.

  Therefore, the in-home server 116 is provided with a disaster forecast acquisition unit 14 that acquires these disaster forecasts. The fire forecast is obtained from the fire detector in the house, and the earthquake and typhoon forecast is obtained from an external server. In addition to these disasters, lightning strikes and maintenance of power distribution facilities by electric power companies can be considered as events that are expected to cause the main power supply 10 to stop. Therefore, the disaster forecast acquisition unit 14 also provides these information as disaster occurrence forecasts. You may get it. Moreover, you may acquire the disaster occurrence forecast not only from wide area network NT but by the emergency broadcast using a broadcast radio wave.

  The charging control unit 13 charges and discharges the secondary battery 162 in a steady state where the power failure monitoring unit 11 has not detected a power failure and the disaster forecast acquisition unit 14 has not acquired a disaster forecast. The secondary battery 162 is discharged at a constant time in order to level the amount of power supplied from the AC power supply AC with respect to load fluctuations associated with the operation or stop of the DC device 102 in the house, but is not the gist of the present invention. Therefore, it will not be described here. Therefore, it is assumed that the charging control unit 13 basically controls the charging current of the secondary battery 162 in a steady state.

  The charge control unit 13 is provided with target setting means 13a for setting the charge amount stored in the secondary battery 162 as a target charge amount. The target setting means 13a includes a first target charge amount related to the charge amount in a steady state and The second target charge amount related to the charge amount after the disaster forecast acquisition unit 14 acquires the disaster forecast is set. The standard value of the target charging amount is set before shipment from the factory, but by using an information terminal or display device 117 that can communicate with the in-home server 116, the user can appropriately adjust it according to the field environment of the DC device 102 in the home. Can be adjusted. The target charge amount is given as a percentage, not as an absolute value of the charge amount.

  In the charge control unit 13, the target charge amount set in the target setting unit 13a is set as a lower limit, and charge control is performed so that the charge amount stored in the secondary battery 162 is maintained within a predetermined range with respect to the lower limit. . Therefore, in a steady state, charge control is performed so that the amount of charge stored in the secondary battery 162 does not fall below the first target charge amount set in the target setting unit 13a. Therefore, even when the main power supply 10 is stopped due to a cause other than a disaster such as an instantaneous power failure of the AC power supply AC, it is possible to continuously operate necessary equipment.

  Further, in the charge control unit 13, when the disaster forecast acquisition unit 14 acquires the occurrence forecast of the disaster, the target charge amount of the target setting unit 13a is switched from the first target charge amount to the second target charge amount. At this time, rapid charging is performed by increasing the charging current so that the amount of charge stored in the secondary battery 162 reaches the second target charge amount in a short time. The first target charge amount is set so as to enable continuous operation for a predetermined time for a predetermined device that needs to be operated even when the main power supply 10 is stopped in the DC device 102. The device and the time can be set by the user using the information terminal or the display device 117. However, since the home server 116 acquires information on the DC device 102 (device type and location information), The server 116 may automatically determine the device that needs to be operated when the main power supply 10 is stopped and the time.

  When the second target charge amount is predicted to increase the number of DC devices 102 that need to be driven for confirmation of safety, etc., because the state in which the main power supply 10 stops is prolonged as in a disaster, It is set in order to secure the necessary charge amount. Therefore, the second target charge amount is larger than the first target charge amount.

  The first target charge amount and the second target charge amount differ depending on the maximum charge amount that can be stored in the secondary battery 162 and the DC device 102 to which the power is backed up. 2 (a), the first target charge amount is set to 20% of the charge amount that can be stored in the secondary battery 162, and the second target charge amount is set to the secondary battery 162 as shown in FIG. 2 (b). Can be set to 60% of the amount of charge that can be stored in (a hatched line indicates the amount of charge stored).

  As is apparent from the above description, the first target charge amount and the second target charge amount mean the lower limit of the amount of charge to be stored, and the stored amount of charge is within a predetermined range with respect to this amount of charge. Therefore, overcharge and overdischarge of the secondary battery 162 can be prevented. Moreover, since the amount of charge stored in the secondary battery 162 is increased as compared to the steady state when the disaster occurrence forecast is acquired, the amount of charge prepared for a disaster can be stored in the secondary battery 162.

  In addition, when a disaster such as a fire, an earthquake, or a typhoon occurs, charging is performed so that the second target charge amount is reached, and the amount of power stored in the secondary battery 162 is increased from that in the normal state. It is possible to secure power to lighting equipment and information equipment necessary for reporting. Furthermore, if only the necessary DC device 102 is operated when a disaster occurs by performing communication with the DC device 102, only the necessary DC device 102 can be operated for each type of disaster. . For example, in the case of a fire, only the lighting device (preferably a guide light) on the evacuation route can be operated, and in the case of an earthquake, only the information device necessary for communication can be operated.

  By the way, it is known that the secondary battery 162 deteriorates due to repeated charge / discharge, and the amount of electricity stored at full charge decreases due to repeated charge / discharge. Therefore, in the present embodiment, the charge control unit 14 is provided with a deterioration evaluation unit 13b that evaluates the degree to which the upper limit of the amount of charge that can be stored in the secondary battery 162 (that is, the amount of charge at full charge) is reduced. The structure which changes the 1st target charge amount and the 2nd target charge amount in the target setting means 13a according to a grade is employ | adopted. That is, the target charge amount is increased as the degree of deterioration is greater. In the deterioration evaluation means 13b, the degree of deterioration is estimated by using a voltage change when the main power supply 10 is discharged for a specified time through a specified load in a steady state when the main power source 10 is not stopped, or the number of charge / discharge is stored and stored. Is estimated.

  For example, the secondary battery 162 is assumed to be capable of storing 100 Ah at full charge as shown in FIG. 3A at the initial stage, and 80 Ah at full charge as shown in FIG. Suppose you can only store the power. In this case, if the first target charge amount is fixed to a value of 20%, in the state of FIG. 3 (a), the storage amount is 20 Ah relative to the first target charge amount. In the state 3 (b), the storage amount is reduced to 16 Ah with respect to the first target charge amount. Therefore, the target charge amount is increased as the fully charged power storage amount decreases, so that the charge amount charged in the secondary battery 162 with respect to the target charge amount is maintained even after the secondary battery 162 is deteriorated. It is. In the example of FIG. 3B, since the first target charge amount is set to 25%, the stored charge amount is 20 Ah.

  Note that the internal resistance increases with the deterioration of the secondary battery 162, and there is a possibility that the amount of charge that can be taken out will decrease even if the amount of stored charge is equal, so the product of the fully charged storage amount and the target charge amount is the product. It is desirable to set the target charge amount so that the product of the fully charged power storage amount and the target charge amount increases with deterioration, rather than setting the target charge amount so as to keep the constant.

  With this operation, even when the secondary battery 162 deteriorates and the charge amount at the time of full charge decreases, the necessary charge amount when the main power supply 10 is stopped can be secured. In addition, it is desirable to set the second target charge amount to 60 to 70% in anticipation of deterioration of the secondary battery 162 even at the initial time.

  In the above-described embodiment, the DC power supply unit 101 is exemplified as the power supply unit, but an AC power supply unit can also be used. In this case, instead of the DC device 102, an AC device is used as the device.

It is a principal part block diagram which shows embodiment of this invention. It is operation | movement explanatory drawing same as the above. It is operation | movement explanatory drawing same as the above. It is a block diagram which shows the whole structure same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main power supply 11 Power failure detection part 12 Power supply control part 13 Charging control part 13a Target setting means 13b Degradation evaluation means 14 Disaster forecast acquisition part 20 Distributed power supply 101 DC power supply part (power supply part)
102 DC equipment (equipment)
116 Home server 162 Secondary battery (battery)
H House (Building)
Wdc DC supply line

Claims (7)

  Charging the secondary battery with a power supply unit that includes a secondary battery and a distributed power source that can back up power when the main power supply is stopped, equipment that is placed in the building and driven by the power supplied from the power supply unit A charge control unit that acquires a disaster forecast for a disaster that is expected to stop the main power supply, and the charge control unit includes a secondary battery after the disaster forecast obtainment unit obtains a forecast for the occurrence of a disaster. An electric power supply system that increases the amount of electric charge stored in the battery from a steady state.   The power supply system according to claim 1, wherein the disaster forecast acquisition unit acquires a fire occurrence forecast obtained from an output of a fire detector installed in a building in which equipment is arranged.   The power supply system according to claim 1, wherein the disaster forecast acquisition unit acquires an earthquake occurrence forecast.   The power supply system according to claim 1, wherein the disaster forecast acquisition unit acquires a typhoon approach forecast.   The charge control unit is configured such that a charge amount stored in the secondary battery in a steady state when the main power supply is not stopped is a charge amount required for a predetermined device of the devices to continue operation for a predetermined time. The power supply system according to any one of claims 1 to 4, wherein a target charge amount that does not fall below the target charge amount is set, and charge control is performed so as not to fall below the target charge amount.   The charge control unit includes a deterioration evaluation unit that obtains a degree to which the upper limit of the amount of charge that can be stored in the secondary battery is reduced from the initial time as an evaluation of the deterioration of the secondary battery at a steady time when the main power supply is not stopped; 6. The power supply system according to claim 5, further comprising target setting means for increasing the target charge amount as the degree of deterioration obtained by the deterioration evaluation means increases.   The power supply system according to any one of claims 1 to 6, wherein the power supply unit supplies DC power, and the device is a DC device driven by DC power.

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