JP3774372B2 - Uninterruptible power supply and uninterruptible power supply system using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an uninterruptible power supply such as a so-called UPS (Uninterruptible Power Supply) and an uninterruptible power supply system using the uninterruptible power supply, and in particular, an uninterruptible power supply using a battery as a power supply source when an AC power supply is abnormal and the same Is related to the improvement of the uninterruptible power supply system using
[0002]
[Prior art]
FIG. 2 is a circuit diagram showing a configuration of a conventional uninterruptible power supply and its peripheral devices. An AC power supply 52 is connected to the input terminal 51 of the uninterruptible power supply 50, and a load device 54 is connected to the output terminal 53.
[0003]
The uninterruptible power supply 50 normally outputs the power input from the input terminal 51 to the output terminal 53 via the bypass wiring 55 and the input changeover switch 56. The input power is converted into direct current by the AC / DC converter 57, and the battery 58 is charged with the direct current power.
[0004]
When the microcomputer 59 detects an abnormality such as a power failure, the input changeover switch 56 selects the output of the DC / AC inverter 60 in accordance with a control signal from the microcomputer 59, whereby the power stored in the battery 58 is output. It is supplied from the terminal 53 to the load device 54.
[0005]
[Problems to be solved by the invention]
By the way, in such an uninterruptible power supply 50, the battery 58 is required to have a power supply capability for supplying a rated voltage and current scheduled in the uninterruptible power supply 50 in a predetermined period. Since the power supply capability of the battery 58 decreases with time, the replacement time is generally set so that the battery 58 is replaced at a time when the power supply capability when not in use falls below the capability guaranteed as product specifications. .
[0006]
However, in the conventional uninterruptible power supply 50, if the input voltage abnormality frequently occurs, the life of the battery 58 is shortened earlier than the period (generally about 3 to 5 years) set as the replacement time of the battery 58. There were problems such as coming. Moreover, the degree of shortening of the service life is not half-finished, for example, when the battery 58 having three and a half years has no more than one year and a half when there is a power outage about once a day. .
[0007]
In particular, the life of such a battery 58 is not of a kind that the user can grasp by visual observation or the like, and if the user has insufficient power supply capability due to such shortening of the life of the battery 58, It is judged that the product is abnormal.
[0008]
The present invention ensures a stable battery life regardless of the power quality of the AC power supply connected to the uninterruptible power supply, and allows the user to replace the battery at a predetermined replacement time without fail. It is an object of the present invention to obtain an uninterruptible power supply and an uninterruptible power supply system that can expect a backup in the event of a power failure with a predetermined power supply capability.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the uninterruptible power supply system of the present invention includes an input terminal to which AC power is connected, an output terminal to which a load device is connected, an input changeover switch connected to the output terminal, An inverter that outputs power stored in the battery to one switching terminal of the input selector switch, bypass wiring that connects the input terminal to the other switching terminal of the input selector switch, and power that is input from the input terminal Converter for supplying power to the battery, setting means for selecting and setting one operation mode from a plurality of operation modes according to the type of the AC power supply, and quality of power input to the input terminal Monitor and switch the input switch from the other switching terminal to the one switching terminal when the predetermined quality is lost. After the supply of the operating mode time are those comprising a control means for outputting a control signal to end the power supply from said one switching terminal.
[0010]
If this configuration is adopted, power supply from the battery can be stopped in a supply time corresponding to the operation mode selected by the setting means. Therefore, by setting the operation mode for an appropriate supply time by the setting means, it is possible to prevent the battery from being discharged more than necessary. As a result, even if used once a day, wasteful discharge can be suppressed, the depth of discharge can be appropriately suppressed, the life of the battery can be prolonged, and the life can be stabilized.
[0011]
In the uninterruptible power supply system of the present invention, the setting means is incorporated in the uninterruptible power supply main body, a setting holding member that holds one selected operation mode, and the selection of the operation mode for the setting holding member And a setting member that outputs a signal.
[0012]
If this configuration is adopted, the setting member can select an appropriate operation mode according to the actual AC power supply state and the like, and based on this, the battery life can be optimized in each AC power supply state. .
[0013]
The uninterruptible power supply of the present invention includes an input terminal to which AC power is connected, an output terminal to which a load device is connected, an input changeover switch connected to the output terminal, and the power stored in the battery as the input. An inverter that outputs to one switching terminal of the changeover switch, a bypass wiring that connects the input terminal to the other switching terminal of the input changeover switch, a converter that supplies power input from the input terminal to the battery, A setting holding member that holds one operation mode selected from a plurality of operation modes according to the type of the AC power source, and the quality of power input to the input terminal are monitored, and when the quality is lost at a predetermined quality The input switch is switched from the other switching terminal to the one switching terminal, and after the supply time of the selected one operation mode, And control means for outputting a control signal to terminate the supply of power from one switching terminal, but with a.
[0014]
If this configuration is adopted, power supply from the battery can be stopped in a supply time corresponding to the operation mode selected by the setting means. Therefore, by setting the operation mode for an appropriate supply time by the setting means, it is possible to prevent the battery from being discharged more than necessary. As a result, even if used once a day, wasteful discharge can be suppressed, the depth of discharge can be appropriately suppressed, the life of the battery can be prolonged, and the life can be stabilized.
[0015]
Uninterruptible power supply of the present invention, said supply time in each operating mode, in which the number of times of use and / or frequency of use of the battery is shortened the greater.
[0016]
By adopting this configuration, the life of the battery due to the difference in the operation mode can be suppressed, and the battery life can be stabilized regardless of the set operation mode.
[0017]
In the uninterruptible power supply according to the present invention, the plurality of operation modes include an operation mode in a case where the plurality of operation modes are not used at least once, and other operation modes include a battery replacement time in the operation mode when not in use. Are set to be shorter than the supply time in the operation mode when each of the supply times is not used even once, so that the replacement times are substantially the same .
[0018]
By adopting this configuration, it is possible to ensure the lifetime in the operation mode when not in use in all the operation modes, and the same capacity battery as other uninterruptible power supply devices sold in Japan based on commercial AC power supply It is possible to ensure the same life while using. Therefore, it is not necessary for the user to use an uninterruptible power supply using a battery with higher capacity than necessary, and the uninterruptible power supply can be obtained inexpensively and ecologically.
[0019]
In the uninterruptible power supply according to the present invention, the plurality of operation modes include an operation mode in a case where the plurality of operation modes are not used at least once, and the other operation modes include a discharge depth of the battery in the operation mode when not in use. Each of the supply times is set to be shorter than the supply time in the operation mode when the supply time is not used even once so that the discharge depth is shallower.
[0020]
By adopting this configuration, the life of the battery due to the difference in the operation mode can be suppressed, and the battery life can be stabilized regardless of the set operation mode.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an uninterruptible power supply of the present invention and an uninterruptible power supply system using the same will be described with reference to the drawings.
[0022]
FIG. 1 is a circuit diagram showing the configuration of the uninterruptible power supply system of the present invention and the connection relationship with peripheral devices. An AC power supply 3 is connected to the input terminal 2 of the uninterruptible power supply 1, and a load device 5 such as a computer or a sequencer is connected to the output terminal 4.
[0023]
The uninterruptible power supply 1 is connected to the power supply circuit 6 at the time of power failure used as a power supply source to the output terminal 4 at the time of a power failure, and to one of the two switching terminals 7 while being connected to the output terminal 4. The input changeover switch 8 to which the power supply circuit 6 at the time of a power failure is connected, the bypass wiring 10 that connects the other changeover terminal 9 of the input changeover switch 8 and the input terminal 2, the input voltage to the input terminal 2 and the like are periodically To the microcomputer 11 as so-called control means for outputting a control signal according to normality / abnormality of the input power quality to the input changeover switch 8 and supplying the time information and information on the battery supply time to the microcomputer 11. Timer 12 as so-called control means.
[0024]
Note that the microcomputer 11 has a function of outputting a notification signal for notifying the load device 5 or the like of a power supply abnormality when an abnormality in the input power quality is detected over a predetermined period, so that the microcomputer 11 is connected as the load device 5. Each computer, sequencer, etc., can independently carry out abnormality processing and save processing. In particular, in a computer or the like having a function of shutting off the power supply itself, the power stop process can be performed according to the setting.
[0025]
The power supply circuit 6 at the time of a power failure includes a battery 13 that can store power, such as a lithium ion battery, and converts the power of the battery 13 into an AC waveform having a cycle substantially similar to the rated voltage waveform of the AC power supply 3. A DC / AC inverter (inverter) 14 that outputs to one of the terminals 7, an AC / DC converter (converter) 15 that is connected to the input terminal 2 and charges the battery 13 with normal power of the AC power supply 3; Is provided.
[0026]
Further, the microcomputer 11 sets the operation mode of the uninterruptible power supply 1 to the trickle mode (operation mode) or the cycle mode (operation mode) according to the type of the AC power supply 3 connected to the uninterruptible power supply 1 by the user. A mode setting switch 16 is connected to this. This mode setting switch 16 holds one operation mode selected by the user from these two operation modes as an effective operation mode, and functions as a so-called setting holding member or setting means.
[0027]
In the trickle mode, when the power supply from the battery 13 has never been performed, the power supply capability (rated voltage, rated value) of the uninterruptible power supply 1 listed in a catalog or the like at a predetermined replacement time of the battery 13 is used. Current, supply time in trickle mode). Therefore, in a power supply environment where there is almost no power failure as in a commercial AC power supply in Japan, if the battery 13 is replaced every predetermined replacement period, the power supply capability of the uninterruptible power supply 1 in such an operation mode can be obtained. You can expect a power backup.
[0028]
On the other hand, in the cycle mode, when power is frequently supplied from the battery 13, the power supply capability (rated voltage, rated current, supply time in the cycle mode) of the uninterruptible power supply 1 listed in a catalog or the like is guaranteed. This is an operation mode. Therefore, this operating mode may be used in an environment where a commercial AC power source is unstable or a power plant in a factory is used as the AC power source 3.
[0029]
In the first embodiment, in particular, the power supply capacity in each mode is set so that the battery replacement period when used in the trickle mode and the replacement period when used in the cycle mode are substantially the same. did. Specifically, assuming a trickle mode replacement period, even if a power failure occurs once a day during the trickle mode replacement period, the same voltage and current as the above-mentioned predetermined rated power can be guaranteed. The possible time was set as the supply time in cycle mode.
[0030]
For example, in a battery in which the replacement period in the trickle mode is set to about 3.5 years by setting the supply time in the trickle mode to 50% (= 50% discharge depth) of the maximum supply power of the battery, the predetermined time The time for which the depth of discharge is about 30% is set as the supply time in the cycle mode so that about 1200 discharges can be performed at the voltage and current of the power supply capability of the cycle mode . As a specific example, the time when the depth of discharge is about 30% corresponds to about 30% of the time when the depth of discharge is 50%, and is about 72 seconds for a battery with a rated load of 4 minutes. Set.
[0031]
As a result, regardless of the selected operation mode, the user can expect power supply capability in the selected operation mode if the battery is replaced at a certain replacement time with peace of mind even if the operation mode is switched halfway. be able to.
[0032]
Incidentally, when such a battery is discharged in the same supply time as in the trickle mode, it can be discharged only about 600 times. In other words, it has only a year and a half under the above conditions. Therefore, if a load device that cannot perform power stop processing based on the notification signal, such as a sequencer, is connected as the load device 5, the battery should be replaced after one and a half years. I will have to. This is less than half of the exchange period in the cycle mode and is unacceptable to the user. Furthermore, when the depth of discharge is 100%, the power supply capability cannot be guaranteed with only about 200 discharges.
[0033]
The microcomputer 11 stores and sets the supply time information in each of the above operation modes. One of these is selected based on the setting of the mode setting switch 16 and the continuous power from the battery 13 is selected. When the supply time becomes equal to or longer than the supply time in the set operation mode, the power supply from the battery 13 is stopped.
[0034]
Next, the operation will be described. The user connects the AC power supply 3 to the input terminal 2 of the uninterruptible power supply 1, connects the predetermined load device 5 to the output terminal 4, and operates the operation mode with the mode setting switch 16 according to the type of the AC power supply 3. Set. For example, the trickle mode is set when a commercial AC power source is used as the AC power source 3 in Japan, and the cycle mode is set when an overseas or factory power plant is used as the AC power source 3.
[0035]
Thus, at the time of initial setting, in the uninterruptible power supply 1, the input changeover switch 8 selects the other changeover terminal 9 based on the control signal of the microcomputer 11, and the input terminal 2 and the output terminal 4 are connected to the bypass wiring 10 and It is directly connected via the input selector switch 8. Therefore, the electric power supplied from the AC power supply 3 is supplied to the load device 5 as it is.
[0036]
Further, the AC power of the AC power source 1 is converted into DC power by the AC / DC converter 15, thereby charging the battery 13.
[0037]
In such a state, when the power supply from the AC power supply 3 is stopped or the power from the AC power supply 3 becomes an abnormal voltage, the microcomputer 11 outputs these input power abnormalities to the input terminal 2. And a control signal for causing the input changeover switch 8 to select one of the changeover terminals 7 is output. As a result, the DC power stored in the battery 13 is converted into AC power in the DC / AC inverter 14 and supplied from the output terminal 4 to the load device 5. Accordingly, the load device 5 is supplied with AC power of a predetermined quality regardless of the abnormal state of the AC power supply 3, so that the operation can be continued normally. At this time, operation stop control may be performed on the AC / DC converter 15 as necessary.
[0038]
The microcomputer 11 performs processing such as reading the count value of the timer 12 or resetting the timer 12 when the abnormal state is detected. Note that the value of the supply time in the selected operation mode may be set in the timer 12.
[0039]
When the microcomputer 11 continues to periodically monitor the abnormal state of the input power and determines that the duration of the abnormal state has exceeded a predetermined period based on the count value from the timer 12, the load device 5 A notification signal for notifying the power supply abnormality is output. As a result, the load device 5 such as a computer or a sequencer can execute a save process and an end process, respectively. In particular, in a computer having an automatic stop function, power consumption is stopped by the stop process, so that unnecessary power consumption can be prevented and the discharge depth of the battery 13 can be kept low.
[0040]
Further, the microcomputer 11 continues to periodically monitor the abnormal state of the input power, and based on the count value from the timer 12, the duration of the abnormal state has become longer than the supply time in the selected operation mode. If it judges, the control signal which completes selection of one change terminal 7 by input changeover switch 8 will be outputted. As a result, the supply of the stored power from the battery 13 to the load device 5 is stopped, and even the load device 5 that does not have an automatic stop function such as a sequencer is forcibly stopped. Note that the selection of one switching terminal 7 may be ended in a state where the other switching terminal 9 is selected. However, in consideration of an abnormal power supply voltage state, any of these switching terminals 7 and 9 may be selected. It is preferable that the state is not selected.
[0041]
Then, by allowing the user to set one of the trickle mode and the cycle mode in this way, the backup operation by the battery 13 is performed with the optimum supply time according to the actual use environment, and those operations are performed. Regardless of the mode selected, the power supply capability of the uninterruptible power supply can be guaranteed by replacing the battery 13 in a predetermined replacement period.
[0042]
Therefore, a distribution board is installed in the sequencer in the factory where the power supply cannot be stopped based on the notification signal, or in the power supply path between the AC power supply 3 and the uninterruptible power supply 1, and the timer on / off control is performed in this distribution board. Even if it is applied to an ATM system or the like, a predetermined power supply capability can be expected only by replacing the battery 13 every predetermined period regardless of the operation mode.
[0043]
Although the above embodiment is a preferred embodiment of the present invention, various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the user sets and holds one operation mode selected by the user as an effective operation mode in the mode setting switch 16, but in addition to this, setting to the uninterruptible power supply An operation mode selection signal is output from a computer (setting member, setting means) having a function incorporated in software or hardware to a setting holding member (setting means) incorporated in the uninterruptible power supply main body. Control by the microcomputer may be set based on the selection.
[0044]
In the above embodiment, one of the two operation modes, the trickle mode and the cycle mode, is selected. However, three or more operation modes can be set by increasing the types of the cycle modes. You may comprise as follows. In this case, in particular, if the power failure log is accumulated in the computer and the operation mode is automatically set and updated appropriately based on this log, the user is not aware of the frequency of power failure. The power supply capability of the uninterruptible power supply can be maintained simply by continuing to replace the battery at a predetermined replacement time.
[0045]
【The invention's effect】
According to the present invention, a stable battery life is ensured regardless of the power quality of the AC power supply connected to the uninterruptible power supply, and the user can reliably and safely replace the battery at a predetermined replacement time. It is possible to obtain an uninterruptible power supply and an uninterruptible power supply system that can expect a backup in the event of a power failure with a predetermined power supply capability.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a configuration of an uninterruptible power supply system of the present invention and a connection relationship with peripheral devices.
FIG. 2 is a circuit diagram showing a configuration of a conventional uninterruptible power supply and peripheral devices thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Uninterruptible power supply 2 Input terminal 3 AC power supply 4 Output terminal 5 Load apparatus 6 Power supply circuit 7 at the time of a power failure One switching terminal 8 Input changeover switch 9 The other switching terminal 10 Bypass wiring 11 Microcomputer (control means)
12 Timer (control means)
13 Battery 14 DC / AC inverter (inverter)
15 AC / DC converter (converter)
16 Mode setting switch (setting holding member, setting means)

Claims (6)

An input terminal to which AC power is connected;
An output terminal to which the load device is connected;
An input changeover switch connected to the output terminal;
An inverter that outputs the power stored in the battery to one switching terminal of the input selector switch;
Bypass wiring for connecting the input terminal to the other switching terminal of the input selector switch;
A converter that feeds power input from the input terminal to the battery;
Setting means for selecting and setting one operation mode from a plurality of operation modes according to the type of the AC power source ;
The quality of the power input to the input terminal is monitored, and when the predetermined quality is lost, the input changeover switch is switched from the other changeover terminal to the one changeover terminal, and the selected one operation mode Control means for outputting a control signal for terminating the power supply from the one switching terminal after the supply time of
An uninterruptible power supply system characterized by comprising: The setting means is incorporated in the uninterruptible power supply main body, and a setting holding member that holds one selected operation mode;
The uninterruptible power supply system according to claim 1, further comprising a setting member that outputs an operation mode selection signal to the setting holding member. An input terminal to which AC power is connected;
An output terminal to which the load device is connected;
An input changeover switch connected to the output terminal;
An inverter that outputs the power stored in the battery to one switching terminal of the input selector switch;
Bypass wiring for connecting the input terminal to the other switching terminal of the input selector switch;
A converter that feeds power input from the input terminal to the battery;
A setting holding member that holds one operation mode selected from a plurality of operation modes according to the type of the AC power source ;
The quality of the power input to the input terminal is monitored, and when the predetermined quality is lost, the input changeover switch is switched from the other changeover terminal to the one changeover terminal, and the selected one operation mode Control means for outputting a control signal for terminating the power supply from the one switching terminal after the supply time of
An uninterruptible power supply comprising: Wherein said supply time in each operating mode, uninterruptible power supply of claim 3, wherein the number of times of use and / or frequency of use of the battery is shortened the greater. The plurality of operation modes include an operation mode in a case where it is not used at least once, and the other operation modes have substantially the same replacement time as the battery replacement time in the non-use operation mode. The uninterruptible power supply according to claim 3, wherein each of the supply times is set to be shorter than the supply time of the operation mode when the supply time has not been used once.   The plurality of operation modes include an operation mode when not used at least once, and the other operation modes have a discharge depth shallower than the discharge depth of the battery in the non-use operation mode. The uninterruptible power supply according to claim 3, wherein each of the supply times is set to be shorter than the supply time of the operation mode when the supply time has not been used once.

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