JP2007089301A - Uninterruptible power supply system and output control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an uninterruptible power supply system for ensuring operational safety improvement. <P>SOLUTION: This uninterruptible power supply system 1-1 is capable of ensuring a predetermined battery retention time by generating an inverter output after rapidly fully charging a battery 6 at power recovery time after a power failure, despite a recurrence of the power failure in a next short period after restart (power failure recovery reboot). Specifically, since the battery 6 is in a fully charged condition an inverter circuit 4 is capable of providing AC power of predetermined AC output voltage Vo to a load apparatus for a predetermined period through an output terminal B, even though the power failure recurs after the restart (power failure recovery reboot). Thus, for instance, when a computer like a server is used as the load apparatus, the problem will be relieved which CPU cannot ensure the time to save necessary data in process into HDD at the occurrence of the power failure, which may result in a disk crash in the worst case. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an uninterruptible power supply, and more particularly to an uninterruptible power supply with high operational stability when power is restored from a power failure.

  In information equipment such as computers and information processing systems, various means are considered in order to improve reliability and operability. As one such means, the uninterruptible power supply greatly contributes to the improvement of system reliability and operability because power supply is indispensable for system operation.

  The battery included in the uninterruptible power supply having such a function needs to be in a fully charged state in preparation for a sudden power failure. As a method of always charging the amount of electricity corresponding to the amount of self-discharge of the battery, a float charge method of charging the battery while always connecting the battery in parallel with the load and supplying power to the load, and a self-discharge amount of the battery at all times There is a trickle charging method in which a battery is charged with a small amount of current to compensate, and the battery is connected to a load during a power failure (for example, Non-Patent Document 1).

  A conventional uninterruptible power supply having such a function is shown in FIG. Hereinafter, description will be given based on this drawing. In FIG. 4, a single line diagram is used.

  The uninterruptible power supply 15 includes an input terminal A, an overcurrent protector 2 connected to the input terminal A, a high power factor rectifier circuit 3 connected to the overcurrent protector 2, and a high power factor rectifier circuit 3. It has a connected inverter circuit 4, an output terminal B connected to the inverter circuit 4, and a battery 16 connected to a connection point between the high power factor rectifier circuit 3 and the inverter circuit 4, and adopts a float charging method. ing. As the battery 16, a lead storage battery, an alkaline storage battery, or the like is generally used.

  The high power factor rectifier circuit 3 includes, for example, a reactor and a MOSFET as a high-speed switching element, and operates as follows by controlling opening and closing of the MOSFET. The AC power supply voltage input via the input terminal A is boosted, and the DC power Pdc whose voltage is stabilized is supplied to the inverter circuit 4 and is also supplied to the battery 6 to charge the battery 6. At the same time, the input current waveform is controlled to be similar to the input voltage waveform, and as a result, power factor correction control is performed.

  The inverter circuit 4 includes, for example, a MOSFET, a transformer, and an AC filter composed of a reactor and a capacitor, and the input DC voltage is intermittently controlled by opening and closing the MOSFET. A predetermined intermittent voltage induced on the secondary side of the transformer by the open / close control of the MOSFET is applied to the AC filter. The AC filter smoothes this intermittent voltage and supplies it to a load device (not shown) via the output terminal B as a predetermined AC output voltage Vo.

  When a power failure occurs in the above configuration, that is, when the AC power Pac input to the input terminal A is interrupted, the DC power Pdc output from the high power factor rectifier circuit 3 is interrupted. At this time, the DC power Pdc ′ from the battery 16 is supplied to the inverter circuit 4, and as a result, even if a power failure occurs, the inverter circuit 4 converts the AC power of the predetermined AC output voltage Vo to the predetermined AC power. Time can be supplied to the load device via the output terminal B.

  Next, when the input voltage is restored, the high power factor rectifier circuit 3 and the inverter circuit 4 are activated, the AC output voltage Vo is supplied to the load device via the output terminal B, and the battery 16 is supplied with a predetermined charging voltage and Charged with charge current.

  This charging voltage value is a voltage that prevents the battery 16 from deteriorating due to overcharging, and depends on the type of battery and the number of cells, and is presented by the battery manufacturer. The charging current value also depends on the type of battery and the number of cells. For example, when a sealed lead-acid battery is charged with a large current, not only the charging efficiency is lowered, but also the life of the battery is reduced due to destruction of the battery active material, lattice corrosion, temperature rise, etc., and the charging current value is limited as a countermeasure.

  These charging voltage value and charging current value are selected from the viewpoint of the above-described limitation, the value of power supplied from the uninterruptible power supply 15 to the load device, the input current limit value by the overcurrent protector 2, and the like. As a result, the battery recovery charge time is usually about 5 to 12 hours.

Masahiro Ichimura, Toshio Horie, Kazuo Takano, “Charging method of secondary battery for communication”, NTT Building Technology Institute 1999, p.1-6 Masaharu Sato, "Organic radical battery that can be charged and discharged in 30 seconds", NIKKEI ELECTRONICS 2004.11.8, p.132-145

  As described above, the conventional uninterruptible power supply 15 requires a recovery charge time of the battery 16 of several hours or more (however, it also depends on the remaining battery capacity and the charge current value at the start of charging). Therefore, to improve the operability of the system, as soon as the input voltage is restored, the high power factor rectifier circuit 3 and the inverter circuit 4 are operated to generate a predetermined AC output voltage Vo and supply it to the load device via the output terminal B. is doing. At this time, in a period less than the recovery charging time of the battery 16, the battery capacity (DC power supply time) is used in an insufficient state. In such a case, for example, when a computer such as a server is used as a load device, it becomes impossible to secure time for storing data necessary for various data processing being executed by the CPU, for example, in the HDD when a power failure occurs, leading to the worst and disk destruction. There is a problem.

  Then, this invention aims at providing the uninterruptible power supply which prevented generation | occurrence | production of the said problem.

  An uninterruptible power supply according to the present invention includes a power supply unit having an input terminal for inputting power and an output terminal for outputting power, and power to the power supply unit when input of power to the input terminal is interrupted. A battery to be supplied; a charging means for charging the battery using the power input to the input terminal; an input detecting means for detecting that the input of power to the input terminal has been resumed; and detecting a full charge of the battery Stops the output of power from the output terminal to the power supply means until the charging completion detection means detects that the battery is fully charged after the charging completion detection means and the input detection means detect the restart of power input. And a control means for making it possible.

  The power supply means inputs power through the input terminal and outputs power through the output terminal. The charging means charges the battery using the electric power input to the input terminal. Here, when the input of power to the input terminal is interrupted, the battery outputs its own power to the power supply means. Thereby, the power supply means continues to output power from the output terminal even in the event of a sudden power failure. Thereafter, when the input of power to the input terminal is resumed, the charging means starts charging the battery again, and the power supply means stops outputting power from the output terminal. When the battery is fully charged, the power supply means starts to output power from the output terminal again.

  Conventionally, power is output from the output terminal before the battery is fully charged at the time of power recovery. For this reason, when a power failure occurs again when the battery is insufficiently charged, power cannot be output from the output terminal, resulting in problems such as destruction of the HDD and loss of data in the volatile memory. On the other hand, according to the present invention, by outputting power from the output terminal after the battery is fully charged at the time of power recovery, it is possible to solve the problem when a power failure occurs again in a short time after power recovery.

  In the uninterruptible power supply according to the present invention, the above-described components may be as follows. The power is first and second AC power. The power supply means receives the first AC power from the input terminal and converts it into DC power, and converts the DC power converted by the first power supply means into second AC power. And second power supply means for outputting from the output terminal. The battery supplies DC power to the second power supply means when the input of the first AC power is cut off. The charging means inputs the first AC power from the input terminal, converts the first AC power into DC power, and charges the battery. The control unit stops the operation of the second power supply unit from when the input detection unit detects the resumption of the input of the first AC power until the charge completion detection unit detects the full charge of the battery. This is one in which the present invention is applied to a general uninterruptible power supply that inputs AC power and outputs AC power.

  The first power supply unit may also serve as the charging unit. In this case, the configuration is simplified.

  Further, the charging completion detection means may detect a charging voltage and a charging current for the battery, and detect a full charge of the battery when the charging voltage and the charging current reach a set value. In this case, the full charge of the battery can be accurately detected.

  Further, the battery may be an organic radical battery. In this case, since the time required for charging the battery is extremely short, the operability of the uninterruptible power supply can be improved. In place of the organic radical battery, a battery that can be charged and discharged at a large current density and can be fully charged within a recovery charge time that is comparable to or less than the discharge time may be used.

  The battery is an organic radical battery, and the charge completion detection means measures the time from when the input detection means detects the restart of power input, and when this time reaches a set value, the battery is fully charged. It may be detected. Since the time required for charging the organic radical battery is extremely short, the difference in charging time based on the difference in remaining capacity does not increase. Therefore, in almost all cases, the battery can be fully charged in a certain time that does not hinder the operability of the uninterruptible power supply. According to this configuration, since it is not necessary to accurately measure full charge, the configuration can be simplified.

  The output control method of the uninterruptible power supply according to the present invention charges a battery while supplying power supplied from the outside to the input terminal to the output terminal, and from the battery when the power supply to the input terminal is cut off. When power is supplied to the output terminal and the supply of power to the input terminal is resumed, the battery is fully charged and then supplied to the output terminal. At this time, an organic radical battery may be used as the battery.

  In other words, in order to solve the above problems, the present invention has the following features.

  According to the first aspect of the present invention, the battery is charged while supplying power supplied from the outside to the input terminal to the output terminal, and when the supply of power to the input terminal is cut off, the battery In an uninterruptible power supply that supplies power to an output terminal and charges the battery while supplying the power to the output terminal when the supply of power to the input terminal is resumed, the power supply to the input terminal is It is characterized by comprising means for fully charging the battery before supplying the power to the output terminal when resuming.

  According to a second aspect of the present invention, a battery that can be charged and discharged with a large current density and has a short recovery charge time is used as the battery.

  According to a third aspect of the present invention, there is provided a charging circuit for charging the battery with a maximum charging power within an input current limit value.

  Further, according to the fourth aspect of the present invention, the input voltage detection means for detecting the supply, disconnection, and resumption of power to the input terminal, and the signal corresponding to the magnitude of the charging current flowing through the battery A current detector that outputs a level; a charging current detector that detects completion of a charging current from a signal level detected by the current detector; and a charging voltage detector that detects completion of a charging voltage from the charging voltage of the battery. Charging completion detecting means for determining completion of charging based on signals from the charging current detecting means and the charging voltage detecting means; and the power to the output terminal based on the charging completion result detected by the charging completion detecting means. It has the means to supply, It is characterized by the above-mentioned.

  According to a fifth aspect of the present invention, there is provided means for giving a predetermined time difference when supplying the power to the output terminal based on the charging completion result.

  According to the present invention, in the present invention, by outputting power from the output terminal after the battery is fully charged at the time of power recovery, due to insufficient power of the battery when a power failure occurs again in a short time after power recovery Problems (for example, destruction of HDD or data loss of volatile memory) can be solved.

  In other words, according to the present invention, a battery that can be charged and discharged with a remarkably large current, a quick charging means for the battery, and the inverter circuit is operated after the battery is fully charged, and a predetermined AC output voltage is obtained. Provided to the load, it is possible to output the battery in a fully charged state after recovery from the power failure, thereby providing an uninterruptible power supply with high operational safety.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing a first embodiment of an uninterruptible power supply according to the present invention. Hereinafter, description will be given based on this drawing. However, the same parts as those in FIG.

  The “first power supply means”, “second power supply means”, “charging means”, “input detection means”, “charge completion detection means”, and “control means” in the claims are described in this embodiment. Then, as specific examples, “high power factor rectifier circuit 3”, “inverter circuit 4”, “high power factor rectifier circuit 3”, “input voltage detection circuit 7”, “current detector 5 and charging current detection circuit 8”, respectively. , Charging voltage detection circuit 9 and charging completion detection circuit 10 ”, and“ sequence control circuit 11-1 ”.

  This embodiment relates to the uninterruptible power supply 1-1 of the float charging method. The uninterruptible power supply 1-1 detects the charging / discharging current of the input voltage detection circuit 7 connected to the connection point of the overcurrent protector 2 and the high power factor rectifier circuit 3 and the battery 6 in addition to the conventional configuration. Current detector 5, charging current detection circuit 8 that receives an output signal from the current detector 5, charging voltage detection circuit 9 that detects the charging voltage of the battery 6, charging current detection circuit 8, and charging voltage detection circuit 9 is a sequence for inputting the output signal of 9, the output signal of the input voltage detection circuit 7 and the charge completion detection circuit 10, and outputting a control signal to the high power factor rectifier circuit 3 and the inverter circuit 4. And a control circuit 11-1.

  Furthermore, in this embodiment, instead of the conventional lead storage battery or alkaline storage battery, a new battery (for example, an organic radical battery, see Non-Patent Document 2) that can be charged and discharged with a much larger current than these batteries 6 is used. Adopted as.

  The current detector 5 is composed of, for example, a current detection coil or a series resistor. The input voltage detection circuit 7 is composed of, for example, a resistor or a transistor. The charging current detection circuit 8 and the charging voltage detection circuit 9 are each composed of a comparator, for example. The charge completion detection circuit 10 includes, for example, an AND gate. In addition, the input voltage detection circuit 7, the charging current detection circuit 8, the charging voltage detection circuit 9, the charging completion detection circuit 10, and the sequence control circuit 11-1 can be configured by, for example, a microcomputer and its program.

  Hereinafter, the operation of the uninterruptible power supply 1-1 will be described focusing on differences from the conventional uninterruptible power supply 7.

  The AC power Pac supplied to the input terminal A is supplied to the high power factor rectifier circuit 3 and the input voltage detection circuit 7 via the overcurrent protector 2. Then, when the input voltage detection circuit 7 confirms that the supplied AC power Pac is in a predetermined voltage range, the input voltage detection circuit 7 outputs a predetermined input voltage normal signal a to the sequence control circuit 11-1. The sequence control circuit 11-1 makes the high power factor rectifier circuit activation signal e1 significant to the high power factor rectifier circuit 3 based on the normal input voltage signal a. The high power factor rectifier circuit 3 supplies the stabilized DC power Pdc to the inverter circuit 4 and the battery 6 based on the high power factor rectifier circuit start signal e1 to charge the battery 6, and the input current waveform Is controlled to be similar to the input voltage waveform, and as a result, power factor correction control is performed.

  The DC power Pdc stabilized by the high power factor rectifier circuit 3 floats the battery 6 via the current detector 5. The battery 6 is composed of a new battery that can be charged and discharged with a much larger current than before, such as an organic radical battery.

  On the other hand, the sequence control circuit 11-1 determines from the high power factor rectifier circuit activation signal e1 based on the input voltage normal signal a or based on the logical product of the UPS activation signal and the input voltage normal signal a (not shown). After the elapse of time, the inverter circuit activation signal e2 is made significant for the inverter circuit 4. The inverter circuit 4 supplies the stabilized AC output voltage Vo to the load device (not shown) via the output terminal B based on the inverter circuit activation signal e2.

  Here, when a power failure occurs, that is, when the AC power Pac input to the input terminal A stops, the DC power Pdc output from the high power factor rectifier circuit 3 is interrupted. At this time, the DC power Pdc ′ from the battery 6 is supplied to the inverter circuit 4, and as a result, even if a power failure occurs, the inverter circuit 4 converts the AC power of the predetermined AC output voltage Vo to a predetermined level. Time can be supplied to the load device via the output terminal B.

  Next, when the input voltage is restored, the AC power Pac supplied to the input terminal A is supplied to the high power factor rectifier circuit 3 and the input voltage detection circuit 7 via the overcurrent protector 2. When the input voltage detection circuit 7 confirms that the supplied AC power Pac is within a predetermined voltage range, the input voltage detection circuit 7 outputs a predetermined input voltage normal signal a to the sequence control circuit 11-1. The sequence control circuit 11-1 outputs a high power factor rectifier circuit activation signal e1 to the high power factor rectifier circuit 3 based on the input voltage normal signal a. The high power factor rectifier circuit 3 supplies the DC power Pdc stabilized based on the high power factor rectifier circuit start signal e1 to the inverter circuit 4 (however, the inverter circuit 4 is in a stopped state at this time) and the battery. 6 is charged to charge the battery 6, and at the same time, the input current waveform is controlled to be similar to the input voltage waveform, and as a result, power factor correction control is performed.

  The DC power Pdc stabilized by the high power factor rectifier circuit 3 rapidly charges the battery 6 via the current detector 5. The output of the high power factor rectifier circuit 3 has a capacity capable of continuously supplying AC power of the AC output voltage Vo to the load device via the inverter circuit 4. Therefore, if all the energy is poured into the battery 6, it can be fully charged in a very short time (approximately the same time as the battery holding time).

  On the other hand, the charging current detection circuit 8 inputs a signal level corresponding to the charging current value output from the current detector 5, and when the signal level is detected to be equal to or less than the float current value at the time of full charge, the charging current is detected. A completion signal b is output to the charging completion detection circuit 10.

  On the other hand, the charging voltage detection circuit 9 directly detects the charging voltage value of the battery 6. If this voltage value is equal to or greater than the full charging voltage value of the battery 6, the charging voltage completion signal c is sent to the charging completion detection circuit 10. Output.

  The charge completion detection circuit 10 calculates the logical product of the charge current completion signal b and the charge voltage completion signal c, and outputs the logical product as the charge completion signal d to the sequence control circuit 11-1.

  The sequence control circuit 11-1 outputs the inverter circuit activation signal e2 after a predetermined time from the input of the charge completion signal d. The inverter circuit 4 generates a predetermined stabilized AC output voltage Vo based on the inverter circuit activation signal e2 and supplies it to the load device via the output terminal B.

  In this case, since the battery 6 is in a fully charged state, even if the power failure recurs immediately after restarting (power failure recovery reboot), the inverter circuit 4 outputs the AC power of the predetermined AC output voltage Vo for a predetermined time. It becomes possible to supply to the load device via B. For this reason, for example, when a computer such as a server is used as a load device, it is not possible to secure time for storing data required for data processing being executed by the CPU in the HDD when a power failure occurs, leading to the worst and disk destruction. The problems such as are relieved.

  In this way, the uninterruptible power supply 1-1 can be recharged after a short time after restarting (power failure recovery reboot) by rapidly charging the battery 6 when the power is restored after a power failure and then causing the inverter to output. Even if it occurs, a predetermined battery holding time can be secured. Thereby, the operational safety of the uninterruptible power supply can be improved.

  A flowchart of the above operation is shown in FIG. Steps 101 to 105 in FIG. 2 are an embodiment of the operation of the uninterruptible power supply 1-1, that is, the output control method of the uninterruptible power supply according to the present invention.

  FIG. 3 is a circuit diagram showing a second embodiment of the uninterruptible power supply according to the present invention. Hereinafter, description will be given based on this drawing. However, the same parts as those in FIG.

  In the present embodiment, the “charging means” in the claims is constituted by “the charging circuit 20 and the charger control circuit 25” instead of the “high power factor rectifier circuit 3”.

  This embodiment relates to a trickle charging uninterruptible power supply 1-2. Below, a different point from the uninterruptible power supply 1-1 of the float charging system of 1st embodiment is mainly demonstrated. The uninterruptible power supply 1-2 is different from the uninterruptible power supply 1-1 of FIG. 1 as follows. The battery 6 is not connected to the connection point between the high power factor rectifier circuit 3 and the inverter circuit 4. That is, the battery 6 is not always connected in parallel with the load. A charging circuit 20, a charger control circuit 25, and a UPS control circuit 52 are connected to a connection point between the overcurrent protector 2 and the high power factor rectifier circuit 3. The battery 6 and the booster circuit 12 are connected to the output side of the charging circuit 20 via the current detector 5. The charger control circuit 25 outputs a control signal T <b> 1 to the charging circuit 20. The UPS control circuit 52 outputs a high power factor rectification circuit activation signal D1 to the high power factor rectification circuit 3, and outputs an inverter circuit activation signal D2 to the inverter circuit 4.

  In the uninterruptible power supply 1-2, the AC input input from the input terminals A1 and A2 is supplied to the high power factor rectifier circuit 3 and the input voltage detection circuit 7 via the overcurrent protector 2. . When the input voltage detection circuit 7 confirms that the supplied AC power Pac is in a predetermined voltage range, the input voltage detection circuit 7 outputs a predetermined input voltage normal signal a to the sequence circuit 11-2. The sequence control circuit 11-2 makes the high power factor rectifier circuit activation signal D1 significant to the high power factor rectifier circuit 3 based on the input voltage normal signal a. The high power factor rectifier circuit 3 supplies the stabilized DC power Pdc to the inverter circuit 4 while performing power factor correction control based on the high power factor rectifier circuit activation signal D1.

  The input AC power Pac is also input to the charging circuit 20, the charger control circuit 25, the UPS control circuit 52, and the like whose output voltage (charging voltage) is stabilized and controlled by the charger control circuit 25.

  The charging circuit 20 includes a MOSFET 2009, a transformer 2008, rectifier diodes 2001-2004, 2007, 2010-2011, reactors 2005, 2012, capacitors 2006, 2013, and the like. The charging circuit 20 opens and closes the MOSFET 2009 in accordance with the control signal T1 from the charger control circuit 25, converts the input AC power supply voltage to a predetermined stabilized DC voltage, and passes the current detector 5 as battery charging power. Supplied to the battery 6.

  The charger control circuit 25 includes error amplifiers 2501 and 2506, reference voltage sources 2505 and 2509, resistors 2502 and 2507, a comparator 2503, a sawtooth wave generator 2508, a drive circuit 2504, and the like. The charger control circuit 25 controls the battery charging voltage value based on the charging current information from the current detector 5. That is, when the battery charging current is equal to or greater than a predetermined value, the stabilized output voltage from the charging circuit 20 is controlled to be equal to or lower than the predetermined value, and is limited by the overcurrent protector 2 by reducing the battery charging power. Make the input current value or less. As a result, the battery 6 is charged with a constant current and a constant voltage.

  As described above, the output of the charging circuit 20 is supplied to the battery 6 via the current detector 5 and also input to the booster circuit 12. The output of the booster circuit 12 is input to the inverter circuit 4.

  The inverter circuit 4 to which the output of the high power factor rectifier circuit 3 and the output of the booster circuit 12 are supplied converts the input DC power Pdc into a predetermined AC output voltage Vo, and the load device is connected via the output terminals B1 and B2. (Not shown).

  When a power failure occurs in the above configuration, that is, when the AC power Pac input between the input terminals A1 and A2 is interrupted, the DC power Pdc output from the high power factor rectifier circuit 3 and the charging circuit 20 is interrupted. At this time, the DC power Pdc ′ from the battery 6 is boosted by the booster circuit 12 as necessary and supplied to the inverter circuit 4. As a result, even if a power failure occurs, the inverter circuit 4 can supply AC power of a predetermined AC output voltage Vo to the load device via the output terminals B1 and B2 for a predetermined time.

  Next, when the input voltage is restored, the AC power Pac supplied between the input terminals A1 and A2 is passed through the overcurrent protector 2 to the high power factor rectifier circuit 3, the charging circuit 20, and the charger control circuit 25. At the same time, it is supplied to the input voltage detection circuit 7 in the UPS control circuit 52.

  The charging circuit 20 opens and closes the MOSFET 2009 according to the control signal T1 from the charger control circuit 25, converts the input AC power supply voltage into a predetermined stabilized DC voltage, and supplies the battery via the current detector 5 as battery charging power. 6 is charged quickly. The battery 6 is composed of a new battery that can be charged and discharged with a much larger current than conventional batteries, such as an organic radical battery.

  On the other hand, the charging current detection circuit 8 in the UPS control circuit 52 inputs a signal level corresponding to the charging current value output from the current detector 5, and this signal level is equal to or less than the trickle current value at full charge. If there is, the charging current completion signal b is output to the charging completion detection circuit 10.

  On the other hand, the charging voltage detection circuit 9 in the UPS control circuit 52 directly detects the charging voltage value of the battery 6, and if this voltage value is equal to or greater than the full charging voltage value of the battery 6, the charging voltage completion signal c is generated. Output to the charging completion detection circuit 10.

  The charge completion detection circuit 10 calculates the logical product of the charge current completion signal b and the charge voltage completion signal c, and outputs the logical product to the sequence control circuit 11-2 as the charge completion signal d.

  The sequence control circuit 11-2 outputs the high power factor rectifier circuit activation signal D1 to the high power factor rectifier circuit 3 after a predetermined time from the input of the charge completion signal d as a starting point. The high power factor rectifier circuit 3 supplies the DC power Pdc stabilized based on the high power factor rectifier circuit activation signal D1 to the inverter circuit 4 (however, the inverter circuit 4 is in a stopped state at this time), and At the same time, the input current waveform is controlled to be similar to the input voltage waveform, and as a result, power factor correction control is performed.

  The sequence control circuit 11-2 outputs the inverter circuit activation signal D2 to the inverter circuit 4 after a predetermined time from the transmission of the high power factor rectifier circuit activation signal D1. The inverter circuit 4 generates a stabilized AC output voltage Vo based on the inverter circuit activation signal D2 and supplies it to the load device via the output terminal B.

  In this case, since the battery 6 is in a fully charged state, even if the power failure recurs after restarting (power failure recovery reboot), the inverter circuit 4 supplies the AC power of the predetermined AC output voltage Vo for a predetermined time for the output terminal B. It becomes possible to supply to the load device via For this reason, for example, when a computer such as a server is used as a load device, it is not possible to secure time for storing, for example, data required for various data processing performed by the CPU in the event of a power failure, for example, in the HDD. The problem of reaching the same is relieved.

  Thus, the uninterruptible power supply 1-2 of this embodiment is short-time after restarting (power failure recovery reboot) by rapidly charging the battery 6 and then outputting the inverter after power recovery from a power failure. Even if a power failure occurs again later, a predetermined battery retention time can be secured. Thereby, the operational safety of the uninterruptible power supply can be improved.

  As mentioned above, although demonstrated according to embodiment about this invention, this invention is not limited to the said embodiment. For example, at least one of the power input from the input terminal and the power output from the output terminal may be direct current. In accordance with this, the configuration of the power supply means may be changed. Instead of the current detector 5, the charging current detection circuit 8, the charging voltage detection circuit 9, and the charging completion detection circuit 10, a timer that measures the time after the restart of power input is detected may be used.

It is a circuit diagram which shows 1st embodiment (float charge system) of the uninterruptible power supply which concerns on this invention. It is a flowchart which shows the operation | movement of the uninterruptible power supply of FIG. It is a circuit diagram which shows 2nd embodiment (a trickle charge system) of the uninterruptible power supply which concerns on this invention. It is a circuit diagram which shows the conventional uninterruptible power supply.

Explanation of symbols

1-1, 1-2 Uninterruptible power supply 2 Overcurrent protector 3 High power factor rectifier circuit 4 Inverter circuit 5 Current detector 6 Battery 7 Input voltage detection circuit 8 Charging current detection circuit 9 Charging voltage detection circuit 10 Charging completion detection Circuit 11-1, 11-2 Sequence control circuit 12 Booster circuit 20 Charging circuit 25 Charger control circuit 52 UPS control circuit A, A1, A2 Input terminal B, B1, B2 Output terminal 2001-2004, 2007, 2010, 2011 Diode 2005, 2012 Reactor 2006, 2013 Capacitor 2008 Transformer 2501, 2506 Error amplifier (E-AMP)
2502, 2507 Resistor 2503 Comparator (CMP)
2504 Drive circuit 2505, 2509 Reference voltage source 2508 Sawtooth generator

Claims (8)

Power supply means having an input terminal for inputting power and an output terminal for outputting power;
A battery for supplying power to the power supply means when input of power to the input terminal is interrupted;
Charging means for charging the battery using electric power input to the input terminal;
Input detection means for detecting that the input of power to the input terminal has been resumed;
Charging completion detection means for detecting full charge of the battery;
The output of the power from the output terminal to the power supply means is stopped until the charging completion detection means detects full charge of the battery after the input detection means detects the restart of the input of the power. Control means for causing
An uninterruptible power supply characterized by comprising: The power input from the input terminal is first AC power, the power output from the output terminal is second AC power,
The power supply means receives the first AC power from the input terminal and converts the first AC power into DC power, and converts the DC power converted by the first power supply means into the second power. A second power supply means for converting to AC power and outputting from the output terminal,
The battery supplies DC power to the second power supply means when the input of the first AC power is interrupted,
The charging means inputs the first AC power from the input terminal and converts the first AC power into DC power to charge the battery,
The control means includes the second power supply means until the full charge of the battery is detected by the charge completion detection means after the input detection means detects the restart of the input of the first AC power. Stop operation,
The uninterruptible power supply according to claim 1. The first power supply means also serves as the charging means;
The uninterruptible power supply according to claim 2 characterized by things. The charging completion detecting means detects a charging voltage and a charging current for the battery, and detects a full charge of the battery when the charging voltage and the charging current reach a set value.
The uninterruptible power supply according to any one of claims 1 to 3. The battery is an organic radical battery,
The uninterruptible power supply device according to any one of claims 1 to 4. The battery is an organic radical battery;
The charge completion detection means measures the time from when the input detection means detects the restart of the input of the power, and detects the full charge of the battery when this time reaches a set value.
The uninterruptible power supply according to any one of claims 1 to 3. Charging the battery while supplying power to the input terminal from the outside,
Supplying power from the battery to the output terminal when power supply to the input terminal is interrupted;
When the supply of power to the input terminal is resumed, the battery is fully charged and then the power is supplied to the output terminal.
An output control method for an uninterruptible power supply. Using an organic radical battery as the battery,
The output control method for an uninterruptible power supply according to claim 7.

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