JP2008211860A - Uninterruptible power unit and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the discharge of a large-capacity battery even when a short-time power failure is repeated, and avoid a large-capacity battery from running short of charge when a long-time power failure occurs, by preparing a battery which is small-capacity and requires short charging time along with a battery which is large-capacity and requires long charging time, and charging the small-capacity battery first in a short time after power recovery, when an input power supply stops. <P>SOLUTION: The uninterruptible power unit 10 has the small-capacity battery 15 requiring short charging time, the large-capacity battery 16 requiring long charging time, and an inverter 12 which converts DC into AC. When the input power 31 stops, the DC output of the storage battery 15 is supplied to the inverter 12 by closing a switch 17, and the inverter 12 supplies AC to electronic equipment 32, in place of the input power 31, and when the battery 15 reaches a discharge limit, a switch 17 and a switch 18 are closed thereby supplying the output of the storage battery 16 to the inverter 12. After power recovery, the battery 15 is charged prior to the battery 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an uninterruptible power supply and a method for controlling the uninterruptible power supply.

  The uninterruptible power supply device is a device that is installed between an input power supply and an electronic device, and supplies electric power of a built-in storage battery to the electronic device when the input power supply voltage drops (power failure). The time during which the uninterruptible power supply can supply power instead of the input power (backup time) is determined by the power consumption of the electronic device and the capacity of the storage battery.

  Conventional uninterruptible power supplies are usually configured with a single storage battery when backing up a short-time power outage of several minutes to several tens of minutes, and specially when backing up a long-time power outage of several tens of minutes to several hours. As described in Kaihei 8-154344, the same storage battery is connected in parallel to extend the power failure backup time. The number of storage batteries is determined by how much the electronic device needs to be operated in the event of a power failure.

JP-A-8-154344

  In general, the charging time of a storage battery corresponding to a long backup time is about 10 times the discharge time. When a power failure occurs again before charging is completed, discharging for backup is started with insufficient charging. Will do. Therefore, if it occurs frequently at intervals shorter than the charging time required by the power failure, there is a problem that insufficient charging of the storage battery is accelerated and the expected backup time cannot be secured.

  The uninterruptible power supply described in JP-A-8-154344 has a configuration in which storage batteries are connected in parallel in order to extend the backup time, but does not have a configuration for shortening the charging time. Therefore, if it occurs frequently at intervals shorter than the charging time required for a power failure, the shortage of charging is accelerated as a whole storage battery, and the above problem cannot be solved.

  In addition, the above problem can be solved by using a storage battery with a short charging time in order to shorten the charging time. However, for example, an organic battery with a very short charging time compared to a lead storage battery that can supply power stably for a long time. An organic radical battery using a compound is expected to be expensive.

  The object of the present invention is to provide a storage battery with a small capacity and a short charging time and a storage battery with a large capacity and a long charging time in order to solve the above-mentioned conventional problems. By charging in a short time when power is restored (recovering from a power failure), even if a short power failure is repeated in a short period of time, the discharge of the large-capacity storage battery is suppressed, and when a long-time power failure occurs, a large-capacity storage battery It is an object to provide an uninterruptible power supply and a method for controlling the uninterruptible power supply that can prevent the battery from being insufficiently charged.

The first uninterruptible power supply of the present invention is an uninterruptible power supply that supplies alternating current to an electronic device instead of the input power when the AC input power is stopped.
It has a storage battery B and a storage battery A that is charged in a shorter time than the storage battery B,
When the input power supply stops, the power of the storage battery A is supplied to the electronic device. When the amount of power of the storage battery A is exhausted, the power of the storage battery B is supplied to the electronic device.
The storage battery A is charged first when the input power is restored, and the storage battery B is charged after the storage battery A is charged.

The second uninterruptible power supply of the present invention is an uninterruptible power supply that supplies alternating current to an electronic device instead of the input power when the alternating current input power is stopped.
A storage battery B, a storage battery A that is charged in a short time compared to the storage battery B, and an inverter that converts the direct current into alternating current and supplies the alternating current to the electronic device,
When the input power supply stops, the DC output of the storage battery A is supplied to the inverter, and the inverter supplies AC to the electronic device instead of the input power supply.
When the storage battery A reaches the discharge limit, the direct current output of the storage battery A is switched to the output of the storage battery B and supplied to the inverter, and the inverter continuously supplies alternating current to the electronic device.

The third uninterruptible power supply of the present invention is an uninterruptible power supply that supplies alternating current to an electronic device in place of the input power when the AC input power is stopped.
A storage battery B, a storage battery A having a smaller capacity than that of the storage battery B, a charger B that converts the input power to DC and charges the storage battery B, and a shorter time than the charger B that converts the input power to DC A battery charger A that charges the storage battery A, an inverter that converts the direct current into alternating current and supplies the alternating current to the electronic device, a switch A that intermittently connects the storage battery A and the inverter, a storage battery B, and the inverter And a switch B that intermittently
When the input power supply stops, switch A is connected and the DC output of storage battery A is supplied to the inverter. When storage battery A reaches the discharge limit, switch A is disconnected and switch B is connected and DC of storage battery A is connected. The output is switched to the direct current output of the storage battery B and supplied to the inverter.

  According to a fourth uninterruptible power supply of the present invention, in the second or third uninterruptible power supply, when the input power is restored, the storage battery A is charged first, and after the charging of the storage battery A is completed, The charging of the storage battery B is started.

  According to a fifth uninterruptible power supply of the present invention, the second or third uninterruptible power supply includes a rectifier that converts alternating current of the input power into direct current and supplies the direct current to the inverter. Is not stopped, the direct current supplied from the rectifier is converted into alternating current, and the alternating current is supplied to the electronic device.

According to a sixth uninterruptible power supply of the present invention, in the second or third uninterruptible power supply, the switch C that intermittently connects the input of the input power and the output to the electronic device, the inverter, and the electronic A switch D for intermittently outputting to the device;
When the input power supply is not stopped, the switch C is connected and the input power is supplied to the electronic device. When the input power supply is stopped, the switch D is connected and the switch C is disconnected. An AC power is supplied to the electronic device by switching the input power source to the output of the inverter.

  A seventh uninterruptible power supply of the present invention is the uninterruptible power supply according to any one of the first to sixth of the present invention, wherein the storage battery A is an organic radical battery using an organic compound, and the storage battery B is lead. It is a storage battery.

The control method of the 1st uninterruptible power supply device of this invention has the storage battery B and the storage battery A charged in a short time compared with the storage battery B, and replaces with an input power supply when alternating current input power supply stops. An uninterruptible power supply control method for supplying alternating current to electronic equipment,
When the input power supply stops, the power of the storage battery A is supplied to the electronic device. When the amount of power of the storage battery A is exhausted, the power of the storage battery B is supplied to the electronic device.
The storage battery A is charged first when the input power is restored, and the storage battery B is charged after the storage battery A is charged.

The second uninterruptible power supply control method of the present invention supplies the electronic device with the storage battery B, the storage battery A that is charged in a shorter time than the storage battery B, and the alternating current converted from direct current to alternating current. A control method for an uninterruptible power supply that supplies alternating current to an electronic device in place of the input power when the AC input power is stopped,
When the input power supply stops, the DC output of the storage battery A is supplied to the inverter, and the inverter supplies AC to the electronic device instead of the input power supply.
When the storage battery A reaches the discharge limit, the direct current output of the storage battery A is switched to the output of the storage battery B and supplied to the inverter, and the inverter continuously supplies alternating current to the electronic device.

The third uninterruptible power supply control method of the present invention includes a storage battery B, a storage battery B having a smaller capacity than the storage battery B, a charger B that charges the storage battery B by converting the input power to direct current, A charger A that converts the input power source into a direct current and charges the storage battery A in a shorter time than the charger B; an inverter that converts the direct current into an alternating current and supplies the alternating current to the electronic device; and the storage battery A and the inverter An uninterruptible power supply that supplies a switch AC to an electronic device in place of the input power when the AC input power is stopped. An apparatus control method comprising:
When the input power supply stops, switch A is connected and the DC output of storage battery A is supplied to the inverter. When storage battery A reaches the discharge limit, switch A is disconnected and switch B is connected and DC of storage battery A is connected. The output is switched to the direct current output of the storage battery B and supplied to the inverter.

  A fourth uninterruptible power supply control method according to the present invention is the second or third uninterruptible power supply control method according to the present invention, wherein the uninterruptible power supply is configured to store the storage battery A when the input power is restored. And charging of the storage battery B is started after the charging of the storage battery A is completed.

  The present invention discharges a small-capacity storage battery first in the event of a short power failure and discharges the storage battery in a short time after power recovery. It has the effect of suppressing the discharge of the storage battery of capacity and avoiding insufficient charging and ensuring a long-time backup.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. Referring to FIG. 1, the uninterruptible power supply 10 is connected to an input power supply 31 and a power supply destination electronic device 32, and supplies power instead of the input power supply 31 when the power supply of the input power supply 31 is stopped. .

  The input power supply 31 supplies power as an AC power supply, and is, for example, a commercial power supply of 50 volts or 60 Hz at 100 volts supplied from an electric power company. The electronic device 32 is a device having an information processing function, such as a computer or a network device. For example, only one device is connected in FIG. 1, but a configuration in which two or more devices are connected may be used.

  The uninterruptible power supply 10 includes a rectifier 11, an inverter 12, a high-speed charger 13 (corresponding to the charger A), a low-speed charger 14 (corresponding to the charger B), and a storage battery 15 (corresponding to the storage battery A). , A storage battery 16 (corresponding to storage battery B), a switch 17 (corresponding to switch A), a switch 18 (corresponding to switch B), a control unit 20 and a detection circuit 21. The fast charger 13 includes a detection circuit 23, and the slow charger 14 includes a detection circuit 24. In FIG. 1, an arrow is attached to a control signal line (a plurality of signals are also shown as one line), and an AC or DC power line is not shown with an arrow.

  The rectifier 11 rectifies and smoothes the alternating current input from the input power supply 31 and converts it into direct current. The rectifier 11 is configured such that the output direct current does not flow backward to the input side when the input power supply 31 is stopped. The inverter 12 converts direct current output from the rectifier 11, the storage battery 15, or the storage battery 16 into alternating current and outputs the alternating current to the electronic device 32. Although the AC output from the inverter 12 will be described below as an AC having the same voltage and frequency as the input power supply 31 and having the same characteristics, the voltage and frequency can be changed.

  The storage battery 15 and the storage battery 16 are rechargeable secondary batteries, and output direct current having the same voltage as that of the rectifier 11. The backup time is determined by the capacity of the storage battery 15 or the storage battery 16 and the power consumption of the electronic device 32.

  It is assumed that the capacity of the storage battery 16 is larger than the capacity of the storage battery 15 and the electronic device 32 can be backed up for a longer time. In addition, the storage battery 15 has a characteristic that the charging time is shorter than that of the storage battery 16, and is charged in a short time, and even if a short-time power failure continues at a short interval, it becomes easy to solve the shortage of charging. .

  For example, since an organic radical battery using an organic compound has a short charging time of about 30 seconds, if it is applied as the storage battery 15, a power failure occurs for a short time (with a capacity sufficient for the organic radical battery) at intervals of 30 seconds or more. However, the discharge of the storage battery 16 can be suppressed. In addition, a lead storage battery having a large capacity and a long charging time is suitable for the storage battery 16. A lithium ion storage battery or nickel hydride storage battery having characteristics intermediate between those of an organic radical battery and a lead storage battery can be used as the storage battery 15 or the storage battery 16 in combination with an organic radical battery or a lead storage battery.

  The high-speed charger 13 has a charging circuit (not shown) that converts the alternating current of the input power supply 31 to direct current and charges the storage battery 15 as necessary while monitoring the charging / discharging state of the storage battery 15 by the detection circuit 23. Then, the charging circuit is operated or stopped according to an instruction from the control unit 20. Similarly, the low-speed charger 14 has a detection circuit 24 and a charging circuit (not shown) for the storage battery 16, and operates or stops the charging circuit according to an instruction from the control unit 20.

  The high-speed charger 13 performs charging in accordance with the characteristics of the storage battery 15 that can be charged in a short time, thereby realizing faster charging than the low-speed charger 14 that charges the storage battery 16 that has a longer charging time than the storage battery 15. To do. However, the charging method is to perform charging according to the characteristics of the storage battery 15 or the storage battery 16, but when there are a plurality of charging methods in the fast charger 13, the fast charger 13 selects the fastest charging method as possible. Thus, the effect of the present invention can be enhanced.

  In addition, when the storage battery 15 or the storage battery 16 to be charged has a characteristic that must be protected from overcharging, the high-speed charger 13 and the low-speed charger 14 automatically stop charging when the battery is fully charged. Alternatively, each charging circuit has a function of protecting the storage battery 16.

  The detection circuit 23 monitors the state of charge of the storage battery 15 during charging, outputs a full charge signal A to the signal line L43 when the storage battery 15 becomes fully charged, and monitors the state of discharge of the storage battery 15 except during charging. Is detected, the discharge limit signal A for notifying the discharge limit is output to the signal line L43. Similarly to the detection circuit 23, the detection circuit 24 monitors the charge / discharge state of the storage battery 16, and outputs the full charge signal B and the discharge limit signal B to the signal line L44. As a method of monitoring the discharge state, the detection circuit 23 and the detection circuit 24 include, for example, a method of monitoring the discharge state by monitoring a decrease in the output voltage of each of the storage battery 15 and the storage battery 16 on the DC output side.

  The switch 17 is closed (connected state) or opened (disconnected state) according to an instruction from the control unit 20, and supplies the DC output of the storage battery 15 to the inverter 12 when the circuit is closed. The switch 18 is closed (connected) or opened (disconnected) according to an instruction from the control unit 20, and supplies the DC output of the storage battery 16 to the inverter 12 when closed.

  The detection circuit 21 is a circuit that detects whether the input power supply 31 is input in a normal state. The input power supply 31 causes a voltage drop due to an instantaneous voltage drop or a power failure (hereinafter referred to as a power failure without distinguishing the instantaneous voltage drop). Is detected and an input power supply abnormality signal is output to the control unit 20 via the signal line L41. For example, the detection circuit 21 can detect a voltage drop by rectifying the alternating current of the input power supply 31 into a direct current and detecting that the direct-current voltage is not more than a specified value.

  This specified value is a value slightly larger than the threshold value at which the inverter 12 can output the rated voltage. The reason why the specified value is made larger than the threshold value is because consideration is given to a delay until the direct current is supplied from the storage battery 15. Therefore, the specified value is determined by adding a value that does not cause the input voltage of the inverter 12 to become less than the threshold value due to the delay. Further, the detection circuit 21 may be detected using a DC voltage after rectification of the rectifier 11 without providing a rectifying circuit.

  The control unit 20 monitors the signal lines L41, L43, and L44, and as a result, controls the high-speed charger 13, the low-speed charger 14, the switch 17, and the switch 18 via the signal lines L43, L44, L47, and L48. The control means is provided with a procedure for performing control, and the details of the control will be described in detail in the description of the operation. Although the control unit 20 may be configured by a hardware circuit, although not illustrated in the present embodiment, the control unit 20 includes a processor, a storage unit, and a control circuit, and executes a program stored in the storage unit by the processor. The control unit 20 outputs the execution result to the signal lines L43, L44, L47, and L48 via the control circuit, and controls the fast charger 13, the slow charger 14, the switch 17, and the switch 18.

  The control unit 20 sends a charge permission instruction or a charge prohibition instruction to the high-speed charger 13 and the low-speed charger 14 via the signal lines L43 and L44, and controls the operation and stop of each charging circuit. The control unit 20 sends an opening instruction or a closing instruction to the switches 17 and 18 via the signal lines L47 and L48, and controls the opening and closing of the switches 17 and 18.

  Next, the operation of the first exemplary embodiment of the present invention will be described with reference to the drawings. First, the operation when the input power supply 31 is normal will be described, and then the operation when the input power supply 31 is stopped will be described with reference to the flowchart of FIG. 2 in addition to FIG.

  In the following description of the operation, the storage battery 15 is an organic radical battery, and the storage battery 16 is a lead storage battery. Further, when the input power supply 31 is normal, the control unit 20 needs to set the charging circuit in an operating state by outputting a charging permission instruction through the signal line L43 or L44 to the charging circuit of the high-speed charger 13 and the low-speed charger 14, respectively. Make it ready for charging. Further, the control unit 20 outputs an opening instruction to the switch 17 and the switch 18 via the signal line L47 or L48, respectively, to make the circuit open, and the output from the storage battery 15 or the storage battery 16 to the inverter 12 is stopped.

  Referring to FIG. 1, the input power supply 31 supplies alternating current to the uninterruptible power supply 10. The rectifier 11 of the uninterruptible power supply 10 rectifies and smoothes the alternating current input from the input power supply 31, converts it into direct current, and outputs it to the inverter 12. The inverter 12 converts the direct current converted by the rectifier 11 into alternating current and supplies the alternating current to the electronic device 32.

  At this time, if the storage battery 15 or the storage battery 16 is not fully charged (not charged after discharging or being charged), the high-speed charger 13 charges the storage battery 15 or the low-speed charger 14 charges the storage battery 16. To do. As described above, when the input power supply 31 is normal, the output of the rectifier 11 is supplied to the inverter 12, and the storage battery 15 and the storage battery 16 are not output, and charging is executed unless they are fully charged.

  Next, the operation when the input power supply 31 is stopped will be described with reference to FIG. 2 in addition to FIG. In the following description, it is assumed that both the storage battery 15 and the storage battery 16 are fully charged at first. First, when the power supply of the input power supply 31 is stopped, the detection circuit 21 detects a voltage drop and outputs an input power supply abnormality signal to the control unit 20 via the signal line L41. When the power supply from the input power supply 31 is stopped, the DC output from the rectifier 11 is also stopped.

  Upon receiving the input power supply abnormality signal, the control unit 20 determines that the voltage drop of the input power supply 31 has occurred (S61), sends a charge prohibition instruction to the fast charger 13 and sends a closing instruction to the switch 17 ( S62).

  The fast charger 13 stops the charging circuit when receiving the charge prohibition instruction. In this case, since charging is not necessary, the operation of the high-speed charger 13 does not change. However, if the storage battery 15 is being charged, the charging circuit operates so as to stop charging. Further, when the switch 17 receives a closing instruction, the switch 17 switches from the open state to the closed state, and supplies the DC output of the storage battery 15 to the inverter 12. In addition, since the time from the detection of the input power supply abnormality to the supply of the storage battery 15 to the inverter 12 of DC output is executed in a short time, the DC output of the storage battery 15 from the rectifier 11 to the inverter 12 does not fall below the threshold value. The direct current output is controlled to be supplied to the inverter 12.

  As a result, the inverter 12 can receive the output from the storage battery 15 before the input voltage becomes equal to or lower than the specified value due to the output of the rectifier 11 being stopped, and continuously output the alternating current as before. Thereafter, the control unit 20 continues to monitor whether the input power 31 has been restored by the detection circuit 21 or whether the discharge limit of the storage battery 15 has been reached. Here, power recovery means that the input power supply 31 is restored to a normal state.

  When the input power supply abnormality signal is not output from the detection circuit 21, the control unit 20 determines that the input power supply 31 has been restored (S 63), instructs the high-speed charger 13 to charge, and instructs the switch 17. The opening instruction is made (S66). When receiving the charge permission instruction, the high-speed charger 13 operates the charging circuit, starts charging, and continues charging until the storage battery 15 is fully charged. The switch 17 switches from the closed state to the open state in response to the opening instruction, and stops supplying the DC output of the storage battery 15 to the inverter 12. Direct current is supplied from the rectifier 11 to the inverter 12.

  After determining that there is no power recovery of the input power supply 31 in step S63, the control unit 20 determines that the storage battery 15 reaches the discharge limit when the discharge limit signal A is output from the detection circuit 23 (S64). 14 is instructed to prohibit charging, instructed to close the switch 18, and instructed to permit charging to the high-speed charger 13 and instructed to open the switch 17 (S 65). If the discharge limit signal is not detected in step S64, the control unit 20 returns to step S63.

  When the low-speed charger 14 receives the charge prohibition instruction, the low-speed charger 14 stops the charging circuit. If the storage battery 16 is being charged, the charging circuit of the low-speed charger 14 operates so as to stop the charging. When the switch 18 receives a closing instruction, the switch 18 switches from an open circuit state to a closed circuit state, and supplies the DC output of the storage battery 16 to the inverter 12 instead of stopping the output from the rectifier 11 and stopping the output from the storage battery 15. This state continues until the input power supply 31 recovers or the storage battery 16 reaches the discharge limit.

  On the other hand, when the high-speed charger 13 receives the charge permission instruction, the high-speed charger 13 operates the charging circuit, but charging is waited until the input power supply 31 recovers. The switch 17 is switched from a closed state to an open state in response to an opening instruction, and stops supplying the output of the storage battery 15 to the inverter 12.

  After executing step S65, the control unit 20 monitors whether the input power supply 31 is restored or the storage battery 16 reaches the discharge limit. When the control unit 20 determines that the input power supply abnormality signal is not output from the detection circuit 21 and is restored (S67), or when the discharge limit signal B is output from the detection circuit 24 and the storage battery 16 reaches the discharge limit (S68), the switch 18 is instructed to open (S69). The switch 18 is switched from a closed state to an open state in response to an opening instruction, and stops supplying the output of the storage battery 16 to the inverter 12. Thereby, for example, the storage battery 16 can prevent deterioration due to overdischarge.

  Next, the control unit 20 determines whether or not the full charge signal A from the detection circuit 23 is detected (S70), and if the full charge signal A is detected, instructs the low-speed charger 14 to permit charging (S71). If the full charge signal A is not detected, step S60 is repeated to wait for the completion of charging of the storage battery 15 (full charge). In about 30 seconds after power recovery, the storage battery 15 is fully charged, and the low-speed charger 14 starts the charging by operating the charging circuit in response to the charging permission instruction. If there is no power failure, the charging continues.

  Next, an operation when a power failure is repeated in a short time will be described. When the storage battery 15 is fully charged, power can be supplied for 60 seconds with respect to the power consumption of the electronic device 32 (that is, the discharge limit is reached after 60 seconds), the charge time from the discharge limit to full charge is 30 seconds, and the first power failure occurs. An example will be described in which power is restored in less than 60 seconds, and then a power failure occurs again after 30 seconds.

  In this case, after step S61 and step S62 are executed by the first power failure, the input power supply 31 is restored (S63) before the storage battery 15 reaches the discharge limit (S64), so step S63 is established and step S66 is established. Is executed.

  When step S66 is executed, the high-speed charger 13 receives the charge permission instruction and operates the charging circuit. Since power has already been restored at this time, the high-speed charger 13 starts charging and continues charging until the storage battery 15 is fully charged. Since there is 30 seconds or more until the next power failure, the storage battery 15 is fully charged when the next power failure occurs. Therefore, even if the power failure is repeated under these conditions, the large-capacity storage battery 16 is not discharged, and a sufficient backup time can be secured.

  Further, when the next power failure occurs in less than 30 seconds and the charge amount is smaller than the discharge amount, the storage battery 15 starts to discharge again before being fully charged. In this case, the time during which the storage battery 15 can supply power to the electronic device 32 is shorter than 60 seconds, but if the power is restored before reaching the discharge limit, the consumption of the storage battery 16 can be avoided.

  Thus, whether or not the discharge of the storage battery 16 can be avoided is determined by the relationship between the occurrence interval of power failure, the capacity of the storage battery 15 and the charging time. Therefore, the present invention can be applied more effectively by determining the storage battery to be employed as the storage battery 15 in accordance with the supply environment of the input power supply 31 and the power consumption of the electronic device 32.

  Further, when the large-capacity storage battery 16 is discharged or after the discharge limit (step S69), the storage battery 15 has reached the discharge limit and the charging circuit is in a charge-permitted state. For this reason, even if power is restored, charging of the storage battery 16 is not immediately started because step S70 is executed, and the uninterruptible power supply 10 operates so as to give priority to the charging of the storage battery 15 that can be charged at high speed.

  Therefore, according to the present invention, since the storage battery 15 having high-speed charging characteristics can be fully charged in the shortest time by avoiding the influence due to the charging of the storage battery 16, a short time (for example, within 60 seconds) after a long power failure. Even if a power failure occurs repeatedly at intervals of 30 seconds or more, power supply to the electronic device 32 can be continued with only the storage battery 15 regardless of the amount of charge of the storage battery 16. The conventional method that does not control the order of charging does not sufficiently charge the storage battery 15, and cannot cope with such a case. In particular, when the storage battery 16 is at the discharge limit, power backup can be performed efficiently by prioritizing the charging of the storage battery 15.

  As described above, the present invention provides two sets of chargers and storage batteries having different charging times, and adopts a configuration in which discharging and charging of a storage battery having a short charging time is performed in advance of a storage battery having a long charging time, When short-time power outages occur frequently, a storage battery with a short charging time is used, and for long-term power outages, the consumption of large-capacity storage batteries is suppressed as much as possible to avoid undercharging conditions and sufficient backup time Can be secured.

  Next, a second embodiment of the present invention will be described with reference to FIG. The uninterruptible power supply 10 according to the first embodiment is configured to rectify the input power supply 31 into direct current with the rectifier 11 and then supply it back to alternating current with the inverter 12, whereas in the second embodiment, The form of the uninterruptible power supply 50 is characterized in that the input power supply 31 is configured to output without passing through the rectifier 11 and the inverter 12.

  Referring to FIG. 3, the uninterruptible power supply 50 receives alternating current from the input power supply 31 and supplies alternating current to the electronic device 32. The uninterruptible power supply 50 adds a switch 51 (corresponding to the switch C) and a switch 52 (corresponding to the switch D) to the uninterruptible power supply 10, and the control unit 53 opens and closes the switch 51. The difference is that the controller 52 is controlled and the rectifier 11 is not included. Since the other functions are the same, the same reference numerals as those in FIG.

  The uninterruptible power supply 50 receives the input power supply 31 not by the rectifier 11 but by the switch 51. The output of the switch 51 is combined with the output of the switch 52 and supplied to the electronic device 32. On the other hand, the direct current output of the storage battery 15 and the storage battery 16 is supplied to the inverter 12 via the switch 17 or the switch 18 and is converted into alternating current by the inverter 12. The AC output of the inverter 12 is supplied to the electronic device 32 via the switch 52.

  Next, the operation of the second exemplary embodiment of the present invention will be described focusing on differences from the uninterruptible power supply 10. When a power failure occurs in the input power supply 31, the detection circuit 21 outputs an input power supply abnormality signal. When the control unit 53 detects the input power supply abnormality signal, the control unit 53 performs control according to the flowchart of FIG. 2, and simultaneously instructs the opening of the switch 51 to open or close at least one of the switch 17 or the switch 18 (steps S62 and S65). The device 52 is instructed to close. Further, when an opening instruction is given to open both the switch 17 and the switch 18 (steps S66 and S69), the opening of the switch 51 and the opening of the switch 52 are simultaneously instructed.

  By controlling in this way, when the input power supply 31 stops, the switch 52 is closed to supply power from the storage battery 15 or the storage battery 16 to the electronic device 32, and at the same time, backflow to the input power supply 31 is avoided. Therefore, the switch 51 is set in an open circuit state. In the uninterruptible power supply 10, the configuration corresponding to the switch 51 was unnecessary because the rectifier 11 fulfilled the function of suppressing the backflow. When the input power supply 31 is restored, the reverse operation is performed. Other operations are the same as those of the uninterruptible power supply 10 and will not be described. However, the uninterruptible power supply 50 also operates in the same manner as the uninterruptible power supply 10 and it is easy to obtain the same effects. Can understand.

  In the above description, the first and second embodiments are configured by combining two sets of chargers and storage batteries, but these sets are expanded to three sets of high speed, medium speed, and low speed depending on the charging time. The structure to perform can also be easily realized. Since a specific implementation method can be easily understood from the above description, the description is omitted.

It is the block diagram which showed the structure of the 1st Embodiment of this invention. It is the flowchart which showed the operation | movement of the 1st Embodiment of this invention. It is the block diagram which showed the structure of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Uninterruptible power supply 11 Rectifier 12 Inverter 13 High-speed charger 14 Low-speed charger 17, 18 Switch 15, 16 Storage battery 20 Control part 21, 23, 24 Detection circuit 31 Input power supply 32 Electronic device 50 Uninterruptible power supply 51, 52 Switch 53 Control unit

Claims (11)

In an uninterruptible power supply that supplies AC to electronic equipment instead of input power when the AC input power stops,
It has a storage battery B and a storage battery A that is charged in a shorter time than the storage battery B,
When the input power supply stops, the power of the storage battery A is supplied to the electronic device. When the amount of power of the storage battery A is exhausted, the power of the storage battery B is supplied to the electronic device.
An uninterruptible power supply, wherein the storage battery A is charged first when the input power is restored, and the storage battery B is charged after the storage battery A is charged. In an uninterruptible power supply that supplies AC to electronic equipment instead of input power when the AC input power stops,
A storage battery B, a storage battery A that is charged in a short time compared to the storage battery B, and an inverter that converts the direct current into alternating current and supplies the alternating current to the electronic device,
When the input power supply stops, the DC output of the storage battery A is supplied to the inverter, and the inverter supplies AC to the electronic device instead of the input power supply.
When the storage battery A reaches a discharge limit, the DC output of the storage battery A is switched to the output of the storage battery B and supplied to the inverter, and the inverter continues to supply AC to the electronic device. In an uninterruptible power supply that supplies AC to electronic equipment instead of input power when the AC input power stops,
A storage battery B, a storage battery A having a smaller capacity than that of the storage battery B, a charger B that converts the input power to DC and charges the storage battery B, and a shorter time than the charger B that converts the input power to DC A battery charger A that charges the storage battery A, an inverter that converts the direct current into alternating current and supplies the alternating current to the electronic device, a switch A that intermittently connects the storage battery A and the inverter, a storage battery B, and the inverter And a switch B that intermittently
When the input power supply stops, switch A is connected and the DC output of storage battery A is supplied to the inverter. When storage battery A reaches the discharge limit, switch A is disconnected and switch B is connected and DC of storage battery A is connected. An uninterruptible power supply, wherein the output is switched to the direct current output of the storage battery B and supplied to the inverter. The uninterruptible power supply according to claim 2 or 3, wherein when the input power is restored, the storage battery A is charged first, and charging of the storage battery B is started after the charging of the storage battery A is completed. A rectifier that converts alternating current of the input power source into direct current and supplies the inverter to the inverter, and the inverter converts direct current supplied from the rectifier to alternating current when the input power source is not stopped, The uninterruptible power supply according to claim 2 or 3, wherein A switch C for intermittently connecting the input of the input power source and an output to the electronic device, and a switch D for intermittently connecting the inverter and the output to the electronic device,
When the input power supply is not stopped, the switch C is connected and the input power is supplied to the electronic device. When the input power supply is stopped, the switch D is connected and the switch C is disconnected. The uninterruptible power supply according to claim 2 or 3, wherein an input power is switched to an output of the inverter to supply alternating current to the electronic device. The uninterruptible power supply according to any one of claims 1 to 6, wherein the storage battery A is an organic radical battery using an organic compound, and the storage battery B is a lead storage battery. A control method for an uninterruptible power supply that has a storage battery B and a storage battery A that is charged in a shorter time than the storage battery B and supplies alternating current to an electronic device instead of the input power supply when the alternating current input power supply stops Because
When the input power supply stops, the power of the storage battery A is supplied to the electronic device. When the amount of power of the storage battery A is exhausted, the power of the storage battery B is supplied to the electronic device.
A control method for an uninterruptible power supply, wherein the storage battery A is charged first when the input power is restored, and the storage battery B is charged after the storage battery A is charged. When the storage battery B, the storage battery A that is charged in a shorter time than the storage battery B, and the inverter that converts the direct current into alternating current and supplies the alternating current to the electronic device, and the alternating current input power is stopped A control method for an uninterruptible power supply that supplies alternating current to an electronic device instead of an input power source,
When the input power supply stops, the DC output of the storage battery A is supplied to the inverter, and the inverter supplies AC to the electronic device instead of the input power supply.
When the storage battery A reaches the discharge limit, the direct current output of the storage battery A is switched to the output of the storage battery B and supplied to the inverter, and the inverter continuously supplies alternating current to the electronic device. Control method. A storage battery B, a storage battery B having a smaller capacity than the storage battery B, a charger B that converts the input power source into direct current to charge the storage battery B, and a shorter time than the charger B that converts the input power source into direct current A battery charger A that charges the storage battery A, an inverter that converts the direct current into alternating current and supplies the alternating current to the electronic device, a switch A that intermittently connects the storage battery A and the inverter, a storage battery B, and the inverter A control method for an uninterruptible power supply that supplies AC to an electronic device in place of the input power when the AC input power is stopped.
When the input power supply stops, switch A is connected and the DC output of storage battery A is supplied to the inverter. When storage battery A reaches the discharge limit, switch A is disconnected and switch B is connected and DC of storage battery A is connected. A control method for an uninterruptible power supply, wherein the output is switched to a direct current output of a storage battery B and supplied to the inverter. 11. The uninterruptible power supply device charges the storage battery A first when the input power is restored, and starts charging the storage battery B after the charging of the storage battery A is completed. Control method for uninterruptible power supply.

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