JP2015023647A - Storage battery system and power supply system having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a storage battery system etc. capable of soft start with a reduced voltage fluctuation accompanying a switchover when continuously supplying power after a consumed storage battery unit is switched to another storage battery unit.SOLUTION: The storage battery system includes a plurality of storage battery units selectively connected in parallel, as a compensation power supply for supplying power to a load at blackout, by the changeover of a switch. The storage battery system further includes, on the output side of a second storage battery unit, a storage battery voltage soft start unit for reducing an abrupt voltage fluctuation from the discharge completion voltage of a first storage battery unit to the discharge start voltage of the second storage battery unit, at the changeover of the switch from the first storage battery unit to the second storage battery unit.

Description

  The present invention relates to a storage battery system that reduces sudden voltage fluctuations associated with switching of storage batteries and a power supply system including the storage battery system.

  The invention aims to provide a power storage system that can be easily installed in factories, buildings, etc. without using a dedicated storage battery room, and is connected to a single power system via an interconnection transformer Power storage units that perform power compensation operations for peak cut and peak shift of the power system with secondary batteries arranged on the DC side of the power converters, each equipped with an interconnection transformer and a secondary battery The total battery capacity of the secondary batteries of the plurality of power storage units is divided into a plurality of units, and the battery capacity of the secondary batteries in each of the plurality of power storage units is set to be less than the prescribed capacity that requires a dedicated storage battery room. Therefore, it is described in Patent Document 1 below that the power compensation operation of a single power system is executed.

According to Patent Document 1, each of the plurality of power storage units has a configuration similar to that of a conventional single power storage system, and the secondary battery used in each power storage unit is a conventional single power storage. It is described that the secondary battery of the system is equivalent to one obtained by dividing and dispersing a plurality of secondary batteries. In addition, the battery capacities of the secondary batteries of each of the plurality of power storage units are all the same or can be arbitrarily set as necessary, but the capacity of all the secondary batteries is small enough not to touch fire-related laws and regulations. Each power storage unit can be installed in a factory or a building without using a dedicated storage battery room by setting the number of divisions of the power storage unit so that the battery capacity can be set small. It is described that it becomes.
Further, the plurality of power storage units are installed in each of a plurality of sections of the building, and the power control controller installed in any single section of the building and the power storage units of each section are connected by a communication line. It is disclosed that each power storage unit can be connected and synchronously coordinated with a power control controller.

  In addition, with the above-described configuration, a power storage system connected to a single power system is configured with the power storage units divided into a plurality of parts, and the battery capacity of the secondary batteries in the plurality of power storage units is reduced by fire fighting. Since it is set small enough not to touch related laws and regulations, it is possible to install a secondary battery without using a dedicated storage battery room even in a power storage system of a single power system with a large power compensation capacity. Thus, it is possible to provide a power storage system that can be installed in a factory or a building in an advantageous manner for capital investment. In addition, since it becomes easy to install a power storage system without building a storage battery room in a new or existing building such as a factory or building, the spread of the power storage system to buildings such as a factory or building It is shown in Patent Document 1 that it becomes easy. FIG. 8 is a block diagram illustrating an outline of the configuration of a conventional power storage system.

  Specifically, as shown in FIG. 8, a plurality of power storage units 8Y,... Are connected in parallel to a single power system 8A composed of a system power supply 81 and a load 82, and a plurality of power storage units 8Y, Is a power storage system that performs a peak cut and peak shift power compensation operation of a single power system 8A by synchronously cooperating with a common power controller 830, and a plurality of power storage units 8Y,. .. By setting the battery capacity of the secondary batteries 816 used for the secondary battery 816 to be less than the required capacity that requires a dedicated storage battery room for fire fighting laws and regulations, all the secondary batteries 816,. A technical idea that enables installation on a floor or the like without using a storage battery room is described.

JP 2001-258158 A

  When multiple storage battery units are connected in parallel and a voltage drop occurs due to consumption of the storage battery units in use, switch to other storage battery units sequentially by switch operation, and use the storage battery units sequentially. Thus, a storage battery system that realizes longer-time power supply compensation is known.

  In such a storage battery system, the electrical characteristics such as capacity and initial voltage of each storage battery unit generally have the same specifications as a default. By using the same electrical characteristics, even when one storage battery unit is consumed and switched to another storage battery unit, the same electrical characteristics can be maintained continuously without fluctuation of the electrical characteristics before and after switching. It is expected to be a compensation power supply that can continue to be supplied to

  On the other hand, when switching the actual storage battery unit, the voltage source is changed from the voltage of the storage battery unit that has been consumed and the output voltage has dropped to the predetermined end-of-discharge voltage to the voltage of another unused storage battery unit in the fully charged state. Will be changed. In this case, the voltage difference between the discharge start voltage (typically the full charge voltage) of the unused storage battery unit immediately after switching and the discharge end voltage of the used storage battery unit immediately before switching is the voltage of the storage battery unit. There is a concern that the voltage difference is not negligible for a DC-DC converter that supplies a desired voltage to the load based on the above.

  Such a sudden voltage fluctuation accompanying the voltage source switching causes a transient phenomenon such as an overshoot in the DC-DC converter to which the voltage is input, thereby causing an unexpected failure. There is also a concern that the converter may be damaged or the load to which the output voltage of the DC-DC converter is supplied is adversely affected.

  The present invention has been made in view of the above-described problems, and even when a consumed storage battery unit is switched to another non-consumed storage battery unit and continuously supplied with power, an abrupt voltage accompanying the switching is obtained. The purpose is to realize a storage battery system capable of soft start with reduced fluctuations.

  A storage battery system according to the present invention includes a plurality of storage battery units connected in parallel so as to be selectable as a compensation power supply to be supplied to a load in the event of a power failure by switching a switch, from the first storage battery unit to the second storage battery unit. When the switch is switched to the second storage battery, the storage battery voltage soft start unit that reduces sudden voltage fluctuations from the voltage of the first storage battery unit that ends discharging to the voltage of the second storage battery unit that starts discharging It is provided on the output side of the unit.

  The power supply system of the present invention includes the above-described storage battery system, and converts from a commercial power supply to a DC power supply for supplying power to a load, and a normal power supply AC-DC converter, and a commercial power supply to a DC power supply supplied to the storage battery system. And a charging AC-DC converter for conversion.

  Even when a consumed storage battery unit is switched to another non-consumed storage battery unit and power is continuously supplied, a storage battery system capable of soft start with reduced sudden voltage fluctuations associated with switching can be realized.

It is a block diagram explaining the composition outline of the power supply system concerning a first embodiment. It is a chart figure explaining the voltage of each part of the power supply system concerning a first embodiment, (a) explains the state change of the voltage waveform from the normal time of a commercial power supply at the time of power failure, and (b) is a radio equipment. (C) explains the change over time of the output voltage accompanying the discharge of the storage battery unit (1), and (d) explains the change in the state of the voltage waveform from the normal time to the power failure. FIG. 6 is a diagram for explaining the change with time of the output voltage accompanying the discharge of the storage battery unit (2), and (e) is a diagram for explaining the change with time of the output voltage of the storage battery voltage soft start unit (1). It is a block diagram explaining the charging / discharging control structural concept of the backup power supply which supplies 48V to a wireless base station. It is a figure explaining the structure outline | summary of the conventional power supply system for the comparison with 1st embodiment. It is a figure explaining the voltage waveform of each part of the conventional power supply system for comparison with the first embodiment, and (a) explains the state change of the voltage waveform from the normal time to the power failure of the commercial power supply, (B) explains the change in the state of the voltage waveform of the DC voltage supplied to the wireless device from the normal time to the time of a power failure, and (c) shows the change over time in the output voltage accompanying the discharge of the storage battery unit (1). FIG. 4 is a diagram for explaining the change with time of the output voltage accompanying the discharge of the storage battery unit (2), and (e) for explaining the change with time of the input voltage to the DC-DC converter. It is a block diagram explaining the structure outline | summary of the power supply system concerning 2nd embodiment. It is a chart explaining the voltage of each part of the power supply system concerning a second embodiment, (a) explains the main change timing of the output voltage with the discharge of the storage battery unit (1) and the main timing of the discharge end signal, FIG. 6B is a diagram for explaining changes over time in the charging voltage (Vc) of the capacitor of the storage battery voltage soft start unit (1), the positive input voltage of the first operational amplifier, and the output voltage of the storage battery voltage soft start unit (1). (C) is a figure explaining the input voltage to a DC-DC converter. It is a block diagram explaining the structure outline | summary of the conventional electric power storage system. It is a flowchart explaining the operation | movement outline | summary at the time of the power failure of the power supply system concerning 2nd embodiment.

  The storage battery system exemplified in the embodiment is a backup storage battery system that can be used for a base station of a wireless device, for example, and is used for backup of a wireless device in order to make a power failure compensation time continuous and relatively long. A plurality of storage battery units are sequentially connected to the DC-DC converter and sequentially discharged.

  In the embodiment, when a storage battery unit in use ends a predetermined discharge and its voltage value decreases to a discharge end voltage, the next storage battery unit is connected to the backup DC via the storage battery voltage soft start unit. -Connect to DC converter.

  The storage battery voltage soft start unit starts from a discharge end voltage (for example, 33 V), which is an output voltage of the storage battery unit before switching, from a discharge start voltage (typically, a full charge voltage (for example, full voltage (for example, 33 V)). 53V)), the voltage is slowly increased over a period of time by the functions of the delay circuit and the delay element.

  Therefore, it is possible to avoid sudden voltage fluctuations before and after the switching of the storage battery unit to the backup DC-DC converter, and unexpected failure or failure due to sudden surge (eg inrush current) or overshoot Can be prevented. In addition, it is possible to reduce the concern that various undesired adverse effects caused by the rapid voltage fluctuation are applied to a desired load to which the output voltage of the backup DC-DC converter is supplied.

(First embodiment)
FIG. 1 is a block diagram illustrating an outline of the configuration of a power supply system 1000 according to the first embodiment. As shown in FIG. 1, the power supply system 1000 includes a normal power supply AC-DC converter 200 that converts an AC voltage of the commercial power supply 100 into a DC voltage, and the normal power supply AC-DC during normal operation except during a power failure. The output voltage (V _O ) of the converter 200 is supplied to the wireless device 300.

  The power supply system 1000 illustrates the wireless device 300 in FIG. 1 as a typical example of a load. The wireless device 300 is one of typical devices that are strongly required to operate and operate as information communication means and information transmission means for people even during non-normal times such as power outages that tend to occur at the same time when a disaster occurs. .

  In addition, in the event of a power outage at the time of a disaster, it may take a considerable amount of time to recover depending on the extent of the disaster, and it may be assumed that the power outage time will take a long time. Therefore, the auxiliary power source for backing up the wireless device 300 is capable of continuing to operate the wireless device 300 for a long time so that the operation of the wireless device 300 can be stably ensured even in a power outage state for a long time.・ Capacity is required.

  On the other hand, from the viewpoint of laws and regulations related to the Fire Service Act, the maximum capacity allowed for a single storage battery is 4800 A · h or less, and the maximum capacity of the container for storing the storage battery and the maximum capacity of the building where the storage battery is installed is also considered. Is required.

  For this reason, in order to ensure stable operation of the wireless device 300 even during a long-time power outage, a plurality of storage battery units that are less than the allowable capacity distributed in a plurality of buildings are sequentially used as backup auxiliary power supplies. In particular, in the case of the wireless device 300, a storage battery system that can be continuously connected to the same load and used is required.

  Therefore, in the present embodiment, the wireless device 300 is shown as a load of the power supply system 1000, but is not limited to the wireless device 300, and even if power is supplied to a desired load as a load of the power supply system 1000. Well, backup power at the time of power failure may be supplied to the desired load.

  As can be understood from FIG. 1, the power supply system 1000 includes a storage battery system 500 that is used as a backup power supply in the event of a power failure, and an AC voltage of the commercial power supply 100 so as to supply charging power to the storage battery system 500. A charging AC-DC converter 400 for conversion.

Further, the output (V _B ) of the storage battery system 500 is converted into a voltage suitable for the wireless device 300 by the DC-DC converter 600 and then supplied to the wireless device 300. That is, the power supply system 1000 supplies power from the commercial power supply 100 via the AC-DC converter 200 for normal power supply to the wireless device 300 during normal time, and the power of the storage battery system 500 charged during normal operation during a power failure. This is supplied to the wireless device 300 via the DC-DC converter 600.

  1, the storage battery system 500 includes a first storage battery unit 510 (1), a second storage battery unit 510 (2), a third storage battery unit 510 (3),..., An nth storage battery unit 510 ( n) arbitrary n storage battery units 510 (1)... 510 (n). In FIG. 1, it is described that arbitrary n storage battery units 510 (1)... 510 (n) are sequentially connected one by one in the event of a power failure and used as a backup power source.

  However, the n storage battery units 510 (1)... 510 (n) are not limited to the method of sequentially using one by one, and may be sequentially used two by two, or three by three. Any number of storage battery units may be used simultaneously depending on the relative relationship between the load supplying backup power and the electrical characteristics of the storage battery units 510 (1)... 510 (n). It is good as well.

  However, in this embodiment, all of the storage battery units 510 (1)... 510 (n) are not used at the same time. From the viewpoint of realizing the long-time backup compensation described above, the storage battery units 510 (1). It is assumed that a switching operation is performed. For example, if the storage battery unit is switched once, it is expected that the backup possible time is approximately doubled.

  1, the storage battery system 500 includes a second storage battery unit 510 (2), a third storage battery unit 510 (3),..., An nth storage battery unit 510 (n). The output voltage of 510 (n) is changed to the first storage battery unit 510 (1), the second storage battery unit 510 (2), the third storage battery unit 510 (3) immediately before switching, the nth- Storage battery voltage soft start unit 520 (1)... For gradually increasing the voltage from each output voltage of the storage battery unit 510 (n-1), that is, outputting the voltage so as to delay.

  Specifically, the output voltage of the discharged first storage battery unit 510 (1) that terminates the backup power supply function is the second storage battery that is used as the backup power supply next by performing the discharge for the required time according to its capacity. It is considerably lower than the initial output voltage of the unit 510 (2).

  For this reason, the storage battery voltage soft start unit 520 (1) connected to the output terminal of the second storage battery unit 510 (2) is connected to the output voltage of the first storage battery unit 510 (1) and the second storage battery unit 510 (1). The second storage battery unit 510 (1) is output from the output voltage of the first storage battery unit 510 (1) so that the output voltage and the voltage difference of 2) are not suddenly applied to the DC-DC converter 600 at the time of switching. The delay operation is performed so as to gradually increase to the output voltage of 2). Therefore, the storage battery voltage soft start unit 520 (1) may be configured using a desired known delay circuit or delay element.

  Similarly, the output voltage of the discharged second storage battery unit 510 (2) that terminates the backup power supply function is the third storage battery unit 510 that is subsequently used as a backup power supply by the discharge process for the required time according to its capacity. It is considerably lower than the output voltage of (3).

  For this reason, the storage battery voltage soft start unit 520 (2) connected to the output terminal of the third storage battery unit 510 (3) is connected to the output voltage of the second storage battery unit 510 (2) and the third storage battery unit 510 (2). In order to prevent the output voltage and the voltage difference of 3) from being suddenly applied to the DC-DC converter 600 at the time of switching, the third storage battery unit 510 ( The delay operation is performed so as to gradually increase to the output voltage of 3). Therefore, the storage battery voltage soft start unit 520 (2) may be configured using a desired known delay circuit or delay element. Hereinafter, it is assumed that the battery voltage soft start unit 520 (n-1) is sequentially provided in the same manner.

  In addition, when the storage battery units 510 (1)... 510 (n) have the same electrical characteristics, the discharge end voltage for terminating the discharge of each storage battery unit 510 (1). It is decided to be single. Therefore, by using an operational amplifier set with the discharge end voltage as a reference value as a buffer and connecting the output of the operational amplifier to the base of a transistor as a switch element, the storage battery voltage soft start unit 520 (1),. Each of the storage battery voltage soft start units 520 (n−1) may be configured.

  In this case, the emitter of the power control element (typically a transistor, FET, etc.) is connected to the output terminal of each storage battery unit 510 (2)... 510 (n), and the collector of the transistor is a DC-DC converter. You may connect to the input terminal of 600, respectively. In this way, (n-1) storage battery voltage soft start units 520 (1)... 520 (n), which is one less than n storage battery units 510 (1). -1). The reason why the number is reduced by one is that, as shown in FIG. 1, when the storage battery unit 510 (1) to be used first is started, it is the first switching from the voltage of the normal power supply AC-DC converter 200. This is because the applied voltage does not fluctuate to the extent that the DC-DC converter 600 may be adversely affected.

  In FIG. 1, the storage battery voltage soft start unit 520 (1) receives the discharge end voltage of the first storage battery unit 510 (1) set in advance as a reference voltage at the positive input terminal of the operational amplifier, and outputs the operational amplifier. The terminal is connected to the negative input terminal of the operational amplifier and to the base of the transistor, and the initial output voltage (discharge start voltage) of the second storage battery unit 510 (2) connected to the emitter of the transistor is the transistor. A configuration is shown in which the output is gradually increased after being delayed by a predetermined time constant.

  Similarly, a storage battery voltage soft start unit 520 (2) (not shown) inputs the discharge end voltage of the second storage battery unit 510 (2) set in advance as a reference voltage to the positive input terminal of the operational amplifier. The output terminal is connected to the negative input terminal of the operational amplifier and to the base of the transistor, and the initial output voltage (discharge start voltage) of the third storage battery unit 510 (3) connected to the emitter of the transistor is A configuration is shown in which the output is gradually increased after being delayed by a predetermined time constant to the collector terminal of the transistor. Hereinafter, similarly, a storage battery voltage soft start unit 520 (n−1) (not shown) can be provided.

  2A and 2B are charts for explaining voltages at various parts of the power supply system 1000. FIG. 2A is a diagram for explaining a change in the voltage waveform of the commercial power supply 100 from a normal time to a power failure, and FIG. (C) explains the change over time in the output voltage accompanying the discharge of the storage battery unit 510 (1), and (d) explains the change in the state of the voltage waveform from the normal time to the power failure. ) Explains the change with time of the output voltage accompanying the discharge of the storage battery unit 510 (2), and (e) shows the change with time of the output voltage of the storage battery voltage soft start unit 520 (1).

  As shown in FIG. 2, the commercial power supply 100 normally has a sinusoidal voltage waveform and is used as a power supply for the wireless device 300. However, the commercial power supply 100 becomes zero when a power failure occurs. Not available.

  On the other hand, when a power failure is detected (not shown because the power failure detection device is already known), the storage battery system 500 starts operating. First, the storage battery unit 510 (1) is turned on and connected to the DC-DC converter 600. The Since the initial output voltage of the storage battery unit 510 (1) in the fully charged state is 53 V, the stored power of the storage battery unit 510 (1) is supplied to the wireless device 300 via the DC-DC converter 600. The direct current voltage input to the device 300 is not interrupted, and the operation of the wireless device 300 is continuously maintained.

  However, if the power failure state continues and the discharge of the storage battery unit 510 (1) continues for a considerable time, the storage amount of the limited storage battery unit 510 (1) is gradually released and correspondingly the output voltage is also reduced. As shown in FIG. 2, it gradually decreases from the initial 53V. In this case, the threshold voltage for stopping the discharge of the storage battery unit 510 (1) (switching to the next storage battery unit) is illustrated as 33V (discharge end voltage) in FIG.

  When the voltage of the storage battery unit 510 (1) becomes 33V, the switch connection of the storage battery unit 510 (1) is released, and instead the switch of the storage battery unit 510 (2) is turned on and connected to the DC-DC converter 600. At this time, since the initial output voltage of the storage battery unit 510 (2) is 53V, there is a voltage difference of 20V from the discharge end voltage (33V) of the storage battery unit 510 (1) immediately before switching.

  The storage battery voltage soft start unit 520 (1) connected to the output terminal of the storage battery unit 510 (2) is configured so that the voltage gradually increases from a preset reference value of 33V to 53V. Is transmitted to the DC-DC converter 600 while being delayed by a desired time constant.

  Therefore, it is avoided that a voltage difference of 20 V is suddenly input to the DC-DC converter 600 when the storage battery unit is switched, and a relatively slow voltage rise is realized over a certain period of time as shown in FIG. . For this reason, it is possible to suppress the occurrence of an unexpected failure such as a surge or overshoot of the DC-DC converter 600, and it is also possible to suppress adverse effects on the wireless device 300.

  Similarly, when the switch of the storage battery unit 510 (2) is connected to the DC-DC converter 600, the initial output voltage of the storage battery unit 510 (2) is 53V, and the stored power of the storage battery unit 510 (2) is Since it is supplied to the wireless device 300 via the DC-DC converter 600, the DC voltage input to the wireless device 300 is continuously maintained without being interrupted.

  However, if the discharge is continued, the storage amount of the limited storage battery unit 510 (2) is released and reduced, and correspondingly, the output voltage gradually decreases from the initial 53V. In this case, the threshold voltage for stopping the discharge of the storage battery unit 510 (2) is, for example, 33V (discharge end voltage) although not shown.

  When the voltage of the storage battery unit 510 (2) becomes 33V, the switch connection of the storage battery unit 510 (2) is released, and instead, the switch of the storage battery unit 510 (3) is turned on and connected to the DC-DC converter 600. At this time, since the initial output voltage of the storage battery unit 510 (3) is 53V, there is a voltage difference of 20V from the discharge end voltage of the storage battery unit 510 (2) immediately before switching.

  The storage battery voltage soft start unit 520 (2) connected to the output terminal of the storage battery unit 510 (3) is configured so that the voltage gradually increases from a preset reference value of 33V to 53V. Is transmitted to the DC-DC converter 600 while being delayed by a desired time constant.

  Accordingly, it is possible to avoid a sudden voltage difference of 20V being input to the DC-DC converter 600 and to achieve a relatively slow voltage rise over a certain period of time. Occurrence of an unexpected failure such as a chute can be suppressed, and adverse effects on the wireless device 300 can also be suppressed. As described above, it is possible to sequentially perform the process of extending the time and mitigating the rapid voltage difference at the time of switching to the storage battery voltage soft start unit 520 (n−1).

  FIG. 3 is a block diagram illustrating a charge / discharge control configuration concept of a backup power supply that supplies 48 V to a radio base station. As shown in FIG. 3, at least one of a plurality of storage battery units having a capacity of less than 1600 Ah · cell housed in a metal casing in accordance with laws and regulations related to the Fire Service Act is connected and discharged as a backup by switch control.

  FIG. 3 shows an example in which up to three units can be connected, and which storage battery unit is connected at which timing is a control configuration that can be automatically switched by switch (SW) control.

  As shown in FIG. 3, a compensation power supply system capable of uninterruptible backup for at least 24 hours can be configured by sequentially using backup from the storage battery unit above the paper surface. Also in the compensation power supply system shown in FIG. 3, by providing the storage battery voltage soft start unit shown in the present embodiment, it is possible to alleviate a sudden voltage change at the time of switching.

(Comparative example)
FIG. 4 is a diagram illustrating a configuration outline of a conventional power supply system 3000 for comparison with the first embodiment. FIG. 5 is a diagram for explaining voltage waveforms of each part of the conventional power supply system 3000 for comparison with the first embodiment.

As shown in FIG. 4, the power supply system 3000 includes a normal power supply AC-DC converter 3200 that converts the AC voltage of the commercial power supply 3100 into a DC voltage, and the normal power supply AC-DC during normal operation except during a power failure. The output voltage (V _O ) of the converter 3200 is supplied to the wireless device 3300.

  The power supply system 3000 illustrates the wireless device 3300 in FIG. 4 as a typical example of the load. The wireless device 3300 is a typical device that is strongly required to operate and operate as an information communication unit, an information transmission unit, and a safety confirmation unit even during non-normal times such as a power failure that tends to occur at the same time when a disaster occurs. One.

  In addition, in the event of a power outage at the time of a disaster, it may take a considerable amount of time to recover depending on the extent of the disaster, and it may be assumed that the power outage time will take a long time. Therefore, the auxiliary power source that backs up the wireless device 3300 can maintain the wireless device 3300 for a long time so that the operation of the wireless device 3300 can be stably ensured even in a power outage state for a long time.・ Capacity is required.

  On the other hand, as already explained, from the viewpoint of laws and regulations related to the Fire Service Law, the maximum capacity allowed as a single storage battery is 4800 A · h or less, and the layout per building where the container or storage battery is installed is installed. It is required to consider the maximum capacity.

  For this reason, in order to ensure stable operation of the wireless device 3300 even during a long-time power outage, a plurality of storage battery units having an allowable capacity or less distributed in a plurality of buildings are sequentially used as backup auxiliary power supplies. In the case of the wireless device 3300, a storage battery system that can be continuously connected to the same load and used is required.

  Therefore, in FIG. 4, the wireless device 3300 is shown as a load of the power supply system 3000, but is not limited to the wireless device 3300, and even if power is supplied to a desired load as a load of the power supply system 3000. Well, backup power at the time of power failure may be supplied to the desired load.

  As can be understood from FIG. 4, the power supply system 3000 is a conventional storage battery system 3500 that is used as a backup power supply in the event of a power failure, and an AC voltage of the commercial power supply 3100 is supplied to the storage battery system 3500 so as to supply charging power. A charging AC-DC converter 3400 for converting the voltage into a voltage.

  Further, the output of the storage battery system 3500 is converted into a voltage suitable for the wireless device 3300 by the DC-DC converter 3600 and then supplied to the wireless device 3300. That is, the power supply system 3000 supplies power from the commercial power supply 3100 to the wireless device 3300 in the normal time to the wireless device 3300, and uses the power of the storage battery system 3500 charged in the normal time in the event of a power failure. This is supplied to the wireless device 3300 via the DC-DC converter 3600.

  4, the storage battery system 3500 includes a first storage battery unit 3510 (1), a second storage battery unit 3510 (2), a third storage battery unit 3510 (3),..., An nth storage battery unit 3510 ( n) arbitrary n storage battery units 3510 (1)... 3510 (n). In FIG. 4, an arbitrary n number of storage battery units 3510 (1)... 510 (n) are described as being sequentially connected one by one at the time of a power failure and used as a backup power source for a load. .

  However, the n storage battery units 3510 (1)... 3510 (n) are not limited to the method of sequentially using one by one, and may be used sequentially by two or three by three. Any number of storage battery units may be used simultaneously depending on the relative relationship between the load for supplying backup power and the electrical characteristics of the storage battery units 3510 (1), 3510 (n). It is good as well.

  However, in this comparative example, all of the storage battery units 3510 (1)... 3510 (n) are not used at the same time, and from the viewpoint of realizing the long-time backup compensation described above, the storage battery units 3510 (1). It is assumed that a switching operation is performed. For example, if the storage battery unit is switched once, it is expected that the backup possible time is approximately doubled.

  Then, the output voltage of the discharged first storage battery unit 3510 (1) that terminates the backup power supply function is discharged to the second storage battery unit 3510 (used as a backup power supply next) by performing discharge for a required time according to the capacity. It is considerably lower than the initial output voltage of 2).

  For this reason, the voltage difference between the output voltage (discharge end voltage) of the first storage battery unit 3510 (1) at the time of switching and the initial output voltage of the second storage battery unit 3510 (2) suddenly becomes DC−. Applied to the DC converter 3600.

  Similarly, the output voltage of the discharged second storage battery unit 3510 (2) that terminates the backup power supply function is the third storage battery unit 3510 used as the backup power supply next by the discharge process for the required time according to the capacity. It is considerably lower than the output voltage of (3).

  For this reason, the voltage difference between the output voltage (discharge end voltage) of the second storage battery unit 3510 (2) at the time of switching and the initial output voltage of the third storage battery unit 3510 (3) suddenly becomes DC− Applied to the DC converter 3600. Hereinafter, in the same manner, for each sequential switching operation of the storage battery units up to the nth storage battery unit 3510 (n), in this comparative example, a sudden voltage difference of 20 V is supplied to the DC-DC converter 3600. Therefore, the total number of times reaches (n-1) times.

  FIGS. 5A and 5B are charts for explaining voltages at various parts of the power supply system 3000. FIG. 5A is a diagram for explaining a change in the voltage waveform of the commercial power supply 3100 from a normal time to a power failure, and FIG. (C) explains the change over time in the output voltage accompanying the discharge of the storage battery unit 3510 (1), and (d) explains the change in the state of the voltage waveform from the normal time to the power failure. ) Illustrates the change with time of the output voltage accompanying the discharge of the storage battery unit 3510 (2), and (e) illustrates the change with time of the input voltage to the DC-DC converter 3600. FIG.

  As shown in FIG. 5, the commercial power supply 3100 normally shows a sine wave voltage waveform and is used as the power supply (54 V) of the wireless device 3300. Is of course not available.

  On the other hand, when a power failure is detected (the power failure detection device is already known because it is not shown), the storage battery system 3500 starts to operate. First, the storage battery unit 3510 (1) is turned on and connected to the DC-DC converter 3600. The The initial output voltage of the storage battery unit 3510 (1) in the fully charged state is 53V, and the stored power of the storage battery unit 3510 (1) is supplied to the wireless device 3300 via the DC-DC converter 3600. The direct current voltage input to the device 3300 is not interrupted, and the operation of the wireless device 3300 is continuously maintained.

  However, if the power failure state continues and the discharge of the storage battery unit 3510 (1) is continued for a considerable time, the storage amount of the limited storage battery unit 3510 (1) is released and gradually decreases, and the output voltage corresponding to this is also reduced. As shown in FIG. 5, it gradually decreases from the initial 53V. In this case, the threshold voltage for stopping the discharge of the storage battery unit 3510 (1) (switching to the next storage battery unit) is illustrated as 33V (discharge end voltage) in FIG.

  When the voltage of the storage battery unit 3510 (1) becomes 33V, the switch connection of the storage battery unit 3510 (1) is released, and instead the switch of the storage battery unit 3510 (2) is turned on and connected to the DC-DC converter 3600. At this time, since the initial output voltage of the storage battery unit 3510 (2) is 53V, there is a voltage difference of 20V from the final discharge voltage (33V) of the storage battery unit 3510 (1) immediately before switching.

  Therefore, since a voltage difference of 20 V is suddenly input to the DC-DC converter 3600 when the storage battery unit is switched, an instantaneous 20 V rectangular voltage rise occurs as shown in FIG. For this reason, the occurrence of an unexpected failure such as a surge or overshoot of the DC-DC converter 3600 is induced, and there is a concern that an adverse effect on the wireless device 3300 is also induced.

  Similarly, when the switch of the storage battery unit 3510 (2) is connected to the DC-DC converter 3600, the initial output voltage of the storage battery unit 3510 (2) is 53V, and the stored power of the storage battery unit 3510 (2) is Since it is supplied to the wireless device 3300 via the DC-DC converter 3600, the direct current voltage input to the wireless device 3300 is continuously maintained without being interrupted.

  However, if the discharge is continued, the storage amount of the limited storage battery unit 3510 (2) is released and reduced, and correspondingly, the output voltage gradually decreases from the initial 53V. In this case, the threshold voltage for stopping the discharge of the storage battery unit 3510 (2) is, for example, 33V (discharge end voltage) although not shown.

  When the voltage of the storage battery unit 3510 (2) becomes 33V, the switch connection of the storage battery unit 3510 (2) is released, and the switch of the storage battery unit 3510 (3) is turned on and connected to the DC-DC converter 3600 instead. At this time, since the initial output voltage of the storage battery unit 3510 (3) is 53V, there is a voltage difference of 20V from the discharge end voltage of the storage battery unit 3510 (2) immediately before switching.

  Therefore, since a voltage difference of 20 V is suddenly input to the DC-DC converter 3600 when the storage battery unit is switched, an instantaneous 20 V rectangular voltage rise occurs as shown in FIG. For this reason, the occurrence of an unexpected failure such as a surge or overshoot of the DC-DC converter 3600 is induced, and there is a concern that an adverse effect on the wireless device 3300 is also induced. As described above, each time the switching to the storage battery unit 3510 (n) is sequentially performed, a relatively large voltage difference of 20 V is applied to the DC-DC converter 3600, and wirelessly indirectly via the DC-DC converter 3600. The apparatus 3300 is affected, and there is a concern that a failure or an unexpected failure may be induced.

(Second embodiment)
FIG. 6 is a block diagram illustrating an outline of the configuration of the power supply system 6000 according to the second embodiment. The power supply system 6000 includes a normal power supply AC-DC converter (not shown) that converts the alternating current voltage of the commercial power supply 6100 into a direct current voltage. The output voltage of the normal power supply AC-DC converter during normal operation except during a power failure ( V _O ) is supplied to the wireless device 6300. However, in FIG. 6, only the backup system used in the non-normal time is shown in order to avoid redundant description.

  The power supply system 6000 illustrates a wireless device 6300 in FIG. 6 as a typical example of a load. The wireless device 6300 is one of typical devices that are strongly required to operate and operate as information communication means and information transmission means for people even during non-normal times such as power outages that tend to occur at the same time when a disaster occurs. .

  In addition, in the event of a power outage at the time of a disaster, it may take a considerable amount of time to recover depending on the extent of the disaster, and it may be assumed that the power outage time will take a long time. Therefore, the auxiliary power source that backs up the wireless device 6300 is capable of continuing to operate the wireless device 6300 for a long time so that the operation of the wireless device 6300 can be stably secured even in a power failure state for a long time.・ Capacity is required.

  On the other hand, from the viewpoint of laws and regulations related to the Fire Service Act, the maximum capacity allowed for a single storage battery is 4800 A · h or less, and the maximum capacity of the container for storing the storage battery and the maximum capacity of the building where the storage battery is installed is also considered. Is required.

  For this reason, in order to ensure stable operation of the wireless device 6300 even in a power outage for a long time, a plurality of storage battery units having an allowable capacity or less distributed and arranged in a plurality of buildings as backup auxiliary power supplies sequentially. In particular, in the case of the wireless device 6300, a storage battery system that can be continuously connected to the same load and used is necessary.

  Therefore, in this embodiment, the wireless device 6300 is shown as a load of the power supply system 6000. However, the present invention is not limited to the wireless device 6300, and even if power is supplied to a desired load as a load of the power supply system 6000. Well, backup power at the time of power failure may be supplied to the desired load.

  Further, as can be understood from FIG. 6, the power supply system 6000 is a storage battery system 6500 used as a backup power supply in the event of a power failure, and the AC voltage of the commercial power supply 6100 is changed to a DC voltage so as to supply charging power to the storage battery system 6500. A charging AC-DC converter 6400 for conversion.

Further, the output (V _B ) of the storage battery system 6500 is converted into a voltage suitable for the wireless device 6300 by the DC-DC converter 6600 and then supplied to the wireless device 6300. That is, the power supply system 6000 supplies electric power from the commercial power supply 6100 to the wireless device 6300 via a normal power supply AC-DC converter (not shown) in the normal time, and the storage battery system 6500 charged in the normal time in the event of a power failure. Power is supplied to the wireless device 6300 through the DC-DC converter 6600.

  In FIG. 6, the storage battery system 6500 includes a first storage battery unit 6510 (1), a second storage battery unit 6510 (2), a third storage battery unit 6510 (3), a fourth storage battery unit 6510 (4), .... Arbitrary n storage battery units 6510 (1), 6510 (n) of the nth storage battery unit 6510 (n). In FIG. 6, arbitrary n storage battery units 6510 (1)... 6510 (n) are described as being sequentially connected one by one at the time of a power failure and used as a backup power source.

  However, the n storage battery units 6510 (1)... 6510 (n) are not limited to the method of sequentially using one by one, and may be used sequentially by two or three by three. Any number of storage battery units may be used simultaneously depending on the relative relationship between the load supplying backup power and the electrical characteristics of the storage battery units 6510 (1) .. 6510 (n). It is good as well.

  However, in the present embodiment, all of the storage battery units 6510 (1)... 6510 (n) are not used at the same time. From the viewpoint of realizing the long-time backup compensation described above, the storage battery units 6510 (1). It is assumed that a switching operation is performed. For example, if the storage battery unit is switched once, it is expected that the backup possible time is approximately doubled.

  6, the storage battery system 6500 includes a second storage battery unit 6510 (2), a third storage battery unit 6510 (3), a fourth storage battery unit 6510 (4),..., An nth storage battery unit 6510 ( n) The output voltage of each of the storage battery units 6510 (2)... 6510 (n) is changed to the first storage battery unit 6510 (1), the second storage battery unit 6510 (2), and the third storage battery unit 6510 immediately before switching. (3), a fourth storage battery unit 6510 (4),..., A storage battery that gradually increases from each output voltage of the (n-1) th storage battery unit 6510 (n-1), that is, outputs a voltage so as to delay. Voltage soft start section 6520 (1), battery voltage soft start section 6520 (2), battery voltage soft start section 6520 (3), ... Includes battery voltage soft-start section 6520 of the (n-1).

  Specifically, the output voltage of the discharged first storage battery unit 6510 (1) that terminates the backup power supply function is the second storage battery that is used as the backup power supply next by performing the discharge for the required time according to its capacity. It is considerably lower than the initial output voltage of unit 6510 (2).

  For this reason, the storage battery voltage soft start unit 6520 (1) connected to the output terminal of the second storage battery unit 6510 (2) is connected to the output voltage of the first storage battery unit 6510 (1) and the second storage battery unit 6510 ( The second storage battery unit 6510 (1) is output from the output voltage of the first storage battery unit 6510 (1) so that the output voltage and the voltage difference of 2) are not suddenly applied to the DC-DC converter 6600 at the time of switching. The delay operation is performed so as to gradually increase to the output voltage of 2). Therefore, the storage battery voltage soft start unit 6520 (1) may be configured using a desired known delay circuit or delay element so that the delay function described above can be exhibited.

  Similarly, the output voltage of the discharged second storage battery unit 6510 (2) that terminates the backup power supply function is the third storage battery unit 6510 used as the backup power supply next by the discharge process for the required time according to its capacity. It is considerably lower than the output voltage of (3).

  Therefore, the storage battery voltage soft start unit 6520 (2) connected to the output terminal of the third storage battery unit 6510 (3) is connected to the output voltage of the second storage battery unit 6510 (2) and the third storage battery unit 6510 ( The third storage battery unit 6510 (2) is output from the output voltage of the second storage battery unit 6510 (2) so that the output voltage and the voltage difference of 3) are not suddenly applied to the DC-DC converter 6600 at the time of switching. The delay operation is performed so as to gradually increase to the output voltage of 3). Therefore, the storage battery voltage soft start unit 6520 (2) may be configured using a desired known delay circuit or delay element so that the delay function described above can be exhibited. Hereinafter, it is assumed that the battery voltage soft start unit 6520 (n-1) is sequentially provided in the same manner.

  In addition, when the storage battery units 6510 (1)... 6510 (n) have the same electrical characteristics, the discharge end voltage for terminating the discharge of each storage battery unit 6510 (1). It is decided to be single. Therefore, the first operational amplifier 6521 (1) set at the positive input terminal with the discharge end voltage as a reference value is used as a buffer, and the output of the first operational amplifier 6521 (1) is the base of a transistor as a switch element. , Storage battery voltage soft start unit 6520 (1),..., Storage battery voltage soft start unit 6520 (n−1) may be configured respectively.

  In this case, the emitter of the transistor may be connected to the output terminal of each storage battery unit 6510 (2)... 6510 (n), and the collector of the transistor may be connected to the input terminal of the DC-DC converter 6600. Thus, for n storage battery units 6510 (1)... 6510 (n), (n-1) storage battery voltage soft start sections 6520 (1). -1). The reason why the number is reduced by one is, as shown in FIG. 6, the first switching from the voltage of the AC-DC converter for normal power supply (not shown) at the start of use of the storage battery unit 6510 (1) that is used first. This is because the voltage applied to the DC-DC converter 6600 does not fluctuate.

  In FIG. 6, the storage battery voltage soft start unit 6520 (1) has a discharge end voltage of the first storage battery unit 6510 (1) preset as a reference voltage at the plus side input terminal of the first operational amplifier 6521 (1). And the output terminal of the first operational amplifier 6521 (1) is connected to the negative input terminal of the first operational amplifier 6521 (1), is connected to the base of the transistor, and is connected to the emitter of the transistor. The configuration is such that the initial output voltage (discharge start voltage) of the second storage battery unit 6510 (2) is output to the collector terminal of the transistor so as to gradually increase after being delayed by a predetermined time constant.

  Here, as can be understood from FIG. 6, the storage battery voltage soft start unit 6520 (1) of the present embodiment is the input value of the reference voltage (Vref) to the plus side terminal of the first operational amplifier 6521 (1) described above. Is provided with a second operational amplifier 6522 (1) having a function of raising the height.

In the second operational amplifier 6522 (1), a discharge end signal output when the storage battery unit 6510 (1) reaches the discharge end voltage is input to the plus side terminal via the resistor (R ₁ ). A capacitor (C) is connected as a delay element between the resistor (R ₁ ) and the positive terminal. The output of the second operational amplifier 6522 (1) is connected to the negative side terminal of the second operational amplifier 6522 (1) and to the ground side so as to raise the above-described reference voltage (Vref). The In this case, in order to effectively raise the reference voltage (Vref), a resistor may be arranged between the output node of the second operational amplifier 6522 (1) and the ground.

  Similarly, a storage battery voltage soft start unit 6520 (2) (not shown) terminates the discharge of the second storage battery unit 6510 (2) preset as a reference voltage at the plus side input terminal of the first operational amplifier 6521 (2). A voltage is input, and the output terminal of the first operational amplifier 6521 (2) is connected to the negative input terminal of the first operational amplifier 6521 (2), is connected to the base of the transistor, and is connected to the emitter of the transistor. In addition, an initial output voltage (discharge start voltage) of the third storage battery unit 6510 (3) is output to the collector terminal of the transistor so as to gradually increase after being delayed by a predetermined time constant.

  Here, as can be understood from FIG. 6, the storage battery voltage soft start unit 6520 (2) of the present embodiment is the input value of the reference voltage (Vref) to the plus side terminal of the first operational amplifier 6521 (2) described above. Is provided with a second operational amplifier 6522 (2) having a function of raising the height.

In the second operational amplifier 6522 (2), a discharge end signal output when the storage battery unit 6510 (2) reaches the discharge end voltage is input to the plus side terminal via the resistor (R ₁ ). A capacitor (C) is connected as a delay element between the resistor (R ₁ ) and the positive terminal. The output of the second operational amplifier 6522 (2) is connected to the negative side terminal of the second operational amplifier 6522 (2) and to the ground side so as to increase the above-described reference voltage (Vref). The In this case, in order to effectively raise the reference voltage (Vref), a resistor may be disposed between the output node of the second operational amplifier 6522 (2) and the ground. Hereinafter, similarly, a storage battery voltage soft start unit 6520 (n-1) (not shown) can be provided.

  FIG. 7 is a chart illustrating the voltages of the respective parts of the power supply system 6000. FIG. 7A illustrates the change over time in the output voltage accompanying the discharge of the storage battery unit 6510 (1) and the main timing of the discharge end signal. b) illustrates the change over time of the charging voltage (Vc) of the capacitor of the storage battery voltage soft start unit 6520 (1), the positive input voltage of the first operational amplifier, and the output voltage of the storage battery voltage soft start unit 6520 (1). It is a figure, (c) is a figure explaining the input voltage to the DC-DC converter 6600.

  Although not shown in FIG. 7, the commercial power source 6100 normally shows a sine wave voltage waveform and is used as the power source of the wireless device 6300. However, when a power failure occurs, the commercial power source 6100 becomes zero in voltage. Of course not available.

On the other hand, when a power failure is detected (the power failure detection device is already known since it is not shown), the storage battery system 6500 starts to operate. First, the storage battery unit 6510 (1) is turned on and connected to the DC-DC converter 6600. The The initial output voltage (V _B ) of the storage battery unit 6510 (1) in the fully charged state is, for example, 53V, and the stored power of the storage battery unit 6510 (1) is supplied to the wireless device 6300 via the DC-DC converter 6600. Therefore, the operation of the wireless device 6300 is continuously maintained without interruption of the DC voltage input to the wireless device 6300.

However, if the power failure state continues and the discharge of the storage battery unit 6510 (1) continues for a considerable period of time, the storage amount of the limited storage battery unit 6510 (1) is released and gradually decreases, and the output voltage ( V _B ) also gradually decreases from the initial voltage as shown in FIG. In this case, the discharge end voltage is set as shown in FIG. 7 as a threshold voltage for stopping the discharge of the storage battery unit 6510 (1) (switching to the next storage battery unit).

  When the voltage of the storage battery unit 6510 (1) reaches the end-of-discharge voltage, the switch connection of the storage battery unit 6510 (1) is released, and instead the switch of the storage battery unit 6510 (2) is turned on and connected to the DC-DC converter 6600. The At this time, since the initial output voltage of the storage battery unit 510 (2) is higher than the end-of-discharge voltage, there is a considerable voltage difference from the end-of-discharge voltage of the storage battery unit 6510 (1) immediately before switching.

  The storage battery voltage soft start unit 6520 (1) connected to the output terminal of the storage battery unit 6510 (2) has a storage battery unit 6510 so that the voltage gradually increases from a discharge end voltage that is a preset reference value (Vref). The initial output voltage of (2) is transmitted to the DC-DC converter 6600 while being delayed by the capacitor (C).

  Therefore, it is avoided that a large voltage difference is suddenly input to the DC-DC converter 6600 when the storage battery unit is switched, and smoothed voltage supply is realized as shown in FIG. For this reason, it is possible to suppress the occurrence of an unexpected failure such as a surge or overshoot of the DC-DC converter 6600, and it is also possible to suppress adverse effects on the wireless device 6300.

  Similarly, when the switch of the storage battery unit 6510 (2) is connected to the DC-DC converter 6600, the initial output voltage of the storage battery unit 6510 (2) is 53V, and the stored power of the storage battery unit 6510 (2) is Since the DC voltage is supplied to the wireless device 6300 via the DC-DC converter 6600, the DC voltage input to the wireless device 6300 is continuously maintained without being interrupted.

  However, if the discharge is continued, the storage amount of the limited storage battery unit 6510 (2) is released and reduced, and correspondingly, the output voltage gradually decreases from the initial 53V. In this case, the threshold voltage for stopping the discharge of the storage battery unit 6510 (2) is, for example, 33V (discharge end voltage) although not shown.

  When the voltage of the storage battery unit 6510 (2) becomes 33V, the switch connection of the storage battery unit 6510 (2) is released, and instead, the switch of the storage battery unit 6510 (3) is turned on and connected to the DC-DC converter 6600. At this time, since the initial output voltage of the storage battery unit 6510 (3) is 53V, there is a voltage difference of 20V from the discharge end voltage of the storage battery unit 6510 (2) immediately before switching.

  The storage battery voltage soft start unit 6520 (2) connected to the output terminal of the storage battery unit 6510 (3) is configured so that the voltage gradually increases from a preset reference value of 33 V to 53 V. Is transmitted to the DC-DC converter 6600 while being delayed by a desired time constant.

  Accordingly, it is avoided that a voltage difference of 20 V is suddenly input to the DC-DC converter 6600, and a relatively slow voltage rise is realized over a certain period of time. The occurrence of an unexpected failure such as a chute can be suppressed, and the adverse effect on the wireless device 6300 can also be suppressed. As described above, it is possible to sequentially perform the process of extending the time and mitigating the abrupt voltage difference at the time of switching to the storage battery voltage soft start unit 6520 (n−1).

  FIG. 9 is a flowchart illustrating an outline of the operation of the power supply system 6000 according to the second embodiment at the time of a power failure. Therefore, an outline of the operation of the power supply system 6000 according to the second embodiment at the time of a power failure will be sequentially described below based on the steps shown in FIG.

(Step S910)
A power failure detection system (not shown) of the power supply system 6000 determines whether the commercial power supply 6100 can be used as a power supply for the wireless device 6300. If the power failure detection system (not shown) of the power supply system 6000 detects the occurrence of a power failure, the process proceeds to step S920. If the power failure detection system (not shown) of the power supply system 6000 detects the occurrence of a power failure, the process waits at step S910. . When a power failure has not occurred, a voltage that is DC-converted from the commercial power source 6100 by the normal power source AC-DC converter is supplied to the wireless device 6300. Further, when no power failure occurs, each storage battery unit 6510 (1)... 6510 (n) of the storage battery system 6500 is charged by a voltage that is DC-converted from the commercial power supply 6100 by the charging AC-DC converter 6400. Is done.

(Step S920)
The switch of the storage battery unit (x) is turned on (however, the initial value of x is “1”). For this reason, the power supply system 6000 switches on and connects the storage battery units 1,..., The storage battery unit n sequentially so that the stored power is supplied to the wireless device 6300 in response to detection of a power failure. May be provided.

(Step S930)
The switch control unit determines whether or not the storage battery unit (x) has output a discharge end signal indicating that the storage battery unit (x) has been reduced to a discharge end voltage due to a voltage drop due to a decrease in the amount of stored electricity as the discharge proceeds. .

  If the switch control unit detects that the discharge end signal is output from the storage battery unit (x), the process proceeds to step S940, and the switch control unit detects that the discharge end signal is output from the storage battery unit (x). Otherwise, the process waits in step S930.

  Each storage battery unit is set to the positive terminal with a predetermined discharge end voltage as a reference value, and the discharge end is stopped by an operational amplifier (comparator) that has input the voltage value obtained by dividing the output voltage of the storage battery unit to the negative side. Although it is possible to output a signal, it may be detected by other known circuit configurations, but is not limited thereto.

(Step S940)
When the storage battery unit (x) outputs a discharge end signal indicating that the stored power has been sufficiently discharged and the voltage has dropped, the switch controller turns off the storage battery unit (x) and disconnects it from the output circuit. Then, the discharge is terminated and the switch of the storage battery unit (x + 1) is turned on to start the discharge.

  When the storage battery unit (x, a natural number of x> 1) is turned on, the storage battery voltage soft start unit (x-1) connected to the output terminal of the storage battery unit (x) is associated with unit switching. Smoothes voltage fluctuation and suppresses fluctuation.

(Step S950)
If the power is restored from the power failure, this flow is terminated. If not, the flow proceeds to step S960.

(Step S960)
1 is added to the value of “x” to obtain “x + 1”, and the process proceeds to step S930.

  Further, the storage battery system of the present invention is a storage battery system including a plurality of storage battery units connected in parallel so as to be selectable as a compensation power supply to be supplied to a load in the event of a power failure by switching a switch. When the switch is switched to the storage battery unit, a second storage battery voltage soft start unit that reduces abrupt voltage fluctuation from the voltage of the first storage battery unit that ends discharge to the voltage of the second storage battery unit that starts discharge Provided on the output side of the storage battery unit.

  Thereby, even when the output voltage of the second storage battery unit immediately after switching is, for example, a full charge voltage and is considerably higher than the used voltage (discharge end voltage) of the first storage battery unit immediately before switching. By starting the voltage supply after switching through the storage battery voltage soft start unit, a rapid fluctuation of the output voltage is suppressed.

  Therefore, the risk of sudden transients such as surges and overshoots in various loads such as DC-DC converters that use the output voltage and wireless devices connected to the DC-DC converters is reduced, and switching stress is reduced. Enables smooth and reduced switching.

  Further, the storage battery system of the present invention preferably has a storage battery voltage soft start unit that switches the voltage from the first storage battery unit to the second storage battery unit, from the voltage of the first storage battery unit that terminates the discharge, The voltage is gradually raised to the voltage of the second storage battery unit that starts discharge.

  As a result, rapid voltage fluctuations associated with the switching are suppressed, and it is possible to continuously supply a stable power source that is smooth as a whole. The first storage battery unit may be composed of a plurality of battery units or a plurality of battery cells. Similarly, the first storage battery unit may be composed of a plurality of battery units or a plurality of battery cells.

  Further, the present invention is not limited to the switching from the first storage battery unit to the second storage battery unit, and similarly, the switching from the second storage battery unit to the third storage battery unit, the third storage battery unit. The present invention can also be applied to the case of switching from the first storage battery unit to the fourth storage battery unit, and so on.

  The storage battery system of the present invention is more preferably characterized in that the storage battery voltage soft start unit includes an operational amplifier that is input to the plus side with reference to a preset discharge end voltage of the first storage battery unit. Accordingly, the operational amplifier functions as a buffer, and the output voltage can be increased from the discharge end voltage of the first storage battery unit to the discharge start voltage of the second storage battery unit.

  Further, the storage battery system of the present invention is more preferably characterized in that the storage battery voltage soft start section includes a transistor having a collector connected to the output of the second storage battery unit and having an emitter as an output. Thus, the switch function of the transistor causes the voltage of the second storage battery unit to correspond to the delay signal or the like input to the base, and gradually increases the output voltage to the discharge start voltage of the second storage battery unit. It can be output and supplied.

  The storage battery system of the present invention is more preferably a capacitor that delays the voltage output of the second storage battery unit when the storage battery voltage soft start unit switches the switch from the first storage battery unit to the second storage battery unit. It is characterized by providing.

  Thereby, a delay effect corresponding to the capacitance of the capacitor can be realized. In other words, when the capacitance of the capacitor is large, the delay is larger and a slower voltage rise is realized. When the capacitance of the capacitor is smaller, the delay is relatively small and a relatively steep voltage rise is realized. Will be.

  For this reason, the capacity of the capacitor is based on the DC-DC converter to which the output of the storage battery system is supplied and the electrical characteristics of the load connected to the DC-DC converter. It is preferable that the capacitance is such that a voltage smoothing effect that does not cause a failure due to voltage fluctuation is obtained.

  The storage battery system of the present invention more preferably outputs a discharge end signal when the first storage battery unit reaches a predetermined discharge end voltage, and the second storage battery unit outputs a storage battery voltage based on the discharge end signal. A voltage is supplied through a soft start unit.

  Thereby, it becomes possible to set it as the storage battery system which can switch a storage battery unit automatically based on a discharge end signal. In addition, the risk of continuing to use a storage battery unit that has already been consumed and has little storage capacity is reduced, and switching to a new storage battery unit can be performed reliably, continuously and safely.

  The voltage level at which the discharge end voltage, which serves as a guide for switching to a new storage battery unit, is set according to the electrical characteristics of the storage battery unit and the characteristics of the DC-DC converter to which the output voltage of the storage battery system is supplied and the load. Different. For example, if the DC-DC converter and the load have relatively strong electrical characteristics against voltage fluctuations, the voltage drop at the time of switching may be relatively large, so the voltage drop proceeds considerably. It is good also as a comparatively small discharge final voltage of the state which carried out.

  In this case, the voltage difference between the discharge end voltage of the first storage battery unit before switching and the voltage of the second storage battery unit after switching becomes relatively large. However, even in this case, sudden and sudden voltage fluctuations are avoided by the action of the storage battery voltage soft start unit.

  In addition, for example, when the DC-DC converter and the load have relatively weak electrical characteristics with respect to voltage fluctuation, it is considered that the voltage fluctuation at the time of switching needs to be relatively small, so that the voltage drop is not much. It is good also as a comparatively big discharge end voltage of the state which is not advancing.

  In this case, the voltage difference between the discharge end voltage of the first storage battery unit before switching and the voltage of the second storage battery unit after switching is relatively small.

  Moreover, the power supply system of this invention is provided with the storage battery system in any one of the above-mentioned. Thereby, it becomes a power supply system which can continue a power supply compensation over a long time which cannot be covered by the power supply only from a single storage battery unit.

  In addition, the upper limit capacity permitted by fire-related laws and regulations as a single storage battery unit is 4800 A · h. By compensating by sequentially switching a plurality of storage battery units, power exceeding 4800 A · h can be extended for a long time. Thus, the power supply system can be continuously supplied.

  More specifically, the plurality of storage battery units may be arranged in separate buildings or buildings, or may be housed in separate containers (for example, metal storage containers).

  Further, the power supply system of the present invention is preferably a normal power supply AC-DC converter that converts a commercial power supply to a DC power supply supplied to a load, and a charging AC that converts the commercial power supply to a DC power supply supplied to a storage battery system. A DC converter is provided.

  As a result, separately from the power supply to the load during normal operation, the storage battery system is charged even during normal operation, and each storage battery unit of the storage battery system is always kept in a fully charged state to prevent non-power failures and the like. It is possible to prepare for normal times.

  The power supply system of the present invention is more preferably characterized by including a DC-DC converter that converts an output voltage of the storage battery system into a voltage supplied to a load. As a result, it is possible to supply voltages corresponding to the electrical characteristics of various loads, and a power supply system that can meet a wide range of needs can be obtained.

  The power supply system of the present invention is more preferably characterized in that the charging AC-DC converter, the storage battery system, and the DC-DC converter are connected in parallel to the normal power supply AC-DC converter. As a result, the power supply can be smoothly switched between the normal time and the non-normal time such as a power failure, and the power supply compensation in the non-normal time can be smoothly performed.

  In the power supply system of the present invention, more preferably, the load is a wireless device. As a result, even if the wireless device is sensitive to voltage fluctuations, or even if a power failure occurs, the wireless device can stably communicate.

  The power supply systems 1000, 6000 and the like exemplified in each of the above embodiments are not limited to the description in the embodiments, and the configurations and the like are appropriately set within the scope of the technical idea described in the embodiments and the obvious range. The operation and the operation method can be changed. For convenience of explanation, the embodiments are individually described. However, the configurations of the embodiments may be applied in an appropriate combination, and the operations may be arranged in an appropriate combination.

  The power supply system of the present invention can be widely applied as a configuration of a power supply system including an emergency backup power supply that can be used for a relatively long time by sequentially switching a plurality of storage batteries in an emergency such as a power failure.

  1000 ·· Power supply system, 100 · · Commercial power supply, 200 · · AC-DC converter for normal power supply, 300 · · Wireless device (load), 400 · · AC-DC converter for charging, 500 · · Storage battery system, 510 · · -Storage battery unit, 520-Storage battery voltage soft start part, 600-DC-DC converter.

Claims (12)

In a storage battery system comprising a plurality of storage battery units connected in parallel so as to be selectable as a compensation power supply to be supplied to a load in the event of a power failure by switching the switch,
When switching the switch from the first storage battery unit to the second storage battery unit, a sudden voltage from the voltage of the first storage battery unit that terminates the discharge to the voltage of the second storage battery unit that starts the discharge A storage battery system comprising: a storage battery voltage soft start unit for reducing fluctuations on an output side of the second storage battery unit. The storage battery system according to claim 1,
The storage battery voltage soft start unit starts the discharge from the voltage of the first storage battery unit that terminates the discharge when switching the switch from the first storage battery unit to the second storage battery unit. A storage battery system characterized by gradually increasing the voltage of the second storage battery unit. The storage battery system according to claim 1 or 2,
The storage battery voltage soft start unit includes an operational amplifier that is input to the plus side with a preset discharge end voltage of the first storage battery unit as a reference. The storage battery system according to any one of claims 1 to 3,
The storage battery voltage soft start section includes a transistor having a collector connected to the output of the second storage battery unit and having an emitter as an output. In the storage battery system according to any one of claims 1 to 4,
The storage battery voltage soft start unit includes a capacitor that delays the voltage output of the second storage battery unit when the switch is switched from the first storage battery unit to the second storage battery unit. Storage battery system. The storage battery system according to any one of claims 1 to 5,
The first storage battery unit outputs a discharge end signal when a predetermined discharge end voltage is reached,
Said 2nd storage battery unit supplies a voltage via said storage battery voltage soft start part based on the said discharge end signal. The storage battery system characterized by the above-mentioned. The storage battery system according to claim 5,
The capacity of the capacitor is a capacity capable of obtaining an output voltage smoothing effect that does not cause a failure due to voltage fluctuation at the time of switching the storage battery unit in an electronic device to which the output of the storage battery system is supplied. . A power supply system comprising the storage battery system according to any one of claims 1 to 7. The power supply system according to claim 8, wherein
A normal power supply AC-DC converter that converts a commercial power supply to a DC power supply that supplies a load; and a charging AC-DC converter that converts the commercial power supply to a DC power supply that supplies the storage battery system. And power system. The power supply system according to claim 9, wherein
A power supply system comprising: a DC-DC converter that converts an output voltage of the storage battery system into a voltage supplied to the load. The power supply system according to claim 10, wherein
The power supply system, wherein the charging AC-DC converter, the storage battery system, and the DC-DC converter are connected in parallel to the normal power supply AC-DC converter. The power supply system according to any one of claims 8 to 11,
The power supply system, wherein the load is a wireless device.

Images