CN101383514B - Ups device - Google Patents
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- CN101383514B CN101383514B CN2008101359321A CN200810135932A CN101383514B CN 101383514 B CN101383514 B CN 101383514B CN 2008101359321 A CN2008101359321 A CN 2008101359321A CN 200810135932 A CN200810135932 A CN 200810135932A CN 101383514 B CN101383514 B CN 101383514B
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Abstract
The invention provides an uninterruptible power supply that supplies stable electric power even at voltage abnormality of the AC power source, extends a period of time of using electric power from the AC power source and decreases the frequency and the periods of time of backup operations even with drop in the power source voltage. A first inverter 4 is connected, in parallel between the AC power source 1 and a load 2. A second inverter 5 is connected, in series, closer to the load side than the first inverter 4. When the power source voltage is in order, the fluctuations of the power source voltage are compensated by the second inverter 5. If the fluctuated portion of the power source voltage exceeds a predetermined voltage 18a, based on the capacitor voltage of the second inverter 5, the power source 1 is cut off by switching off a change-over switch 6 and the backup operations are carried out by using the first and second inverters 4, 5.
Description
Technical field
The present invention relates to a kind of uninterrupted power supply(ups), it can suppress to supply to from AC power the variation in voltage of the alternating electromotive force of load, and also can be to the load supply capability when having a power failure.
Background technology
Existing uninterrupted power supply(ups) is receiving the electricity point to have switch and power failure detecting unit, and in addition, this uninterrupted power supply(ups) also has: shunt chopper; Series inverter, its AC side be connected in series in tie point between this shunt chopper and the switch, and between the supply terminals of load; And accumulation of energy portion, the two DC side of itself and shunt chopper and series inverter is connected.
At power supply just often, make switch conduction and to the supply terminals supply capability of load, shunt chopper receives electric Current Control.In addition, when supply voltage is lower than set point, be judged to be power failure,, and carry out voltage through series inverter and adjust (for example with reference to patent documentation 1) with the switch disconnection and from the supply terminals supply capability of shunt chopper to load.
In addition, in another example of existing uninterrupted power supply(ups), when source power supply just often, power to the load by source power supply, if detect power failure, then start uninterrupted power supply(ups) and switch to storage battery power supply (for example with reference to non-patent literature 1).
Patent documentation 1: the spy opens the 2004-96831 communique
Patent Document 1: "uninterruptible power supply into practice ga イ cloth, electrical College", February 25, 1989
Summary of the invention
The uninterrupted power supply(ups) that above-mentioned patent documentation 1 is put down in writing is judged to be power failure if supply voltage is lower than set point, and switch is broken off and cuts off the electricity supply, and utilizes the electric power of accumulation of energy portion that electric power is carried out in load and supplies with.Accumulation of energy portion just often charges from power supply at supply voltage, and then just discharge when having a power failure is difficult to continue for a long time to carry out to supply with the such reserve running of stable electric power to load.
In addition,, just switch to storage battery power supply, can produce harmful effect the life of storage battery whenever detecting when having a power failure even as above-mentioned non-patent literature 2, use storage battery.
The present invention proposes in order to address the above problem; Its objective is to uninterrupted power supply(ups); Even when AC power is unusual, also can prolong service time, reduce and cut off frequency and the time that AC power is carried out the reserve running from the electric power of AC power.
Uninterrupted power supply(ups) of the present invention has: the 1st inverter, and it is connected in parallel between AC power and the load, will be transformed to alternating electromotive force from the direct current power of the 1st DC power supply; The 2nd inverter; It will be transformed to alternating electromotive force from the direct current power of 2nd DC power supply lower than above-mentioned the 1st DC power supply voltage; The AC side of the 2nd inverter, is being connected in series between above-mentioned AC power and this load more on the position near above-mentioned load-side than above-mentioned the 1st inverter; Diverter switch, it is connected in series between the AC side of above-mentioned AC power and above-mentioned the 2nd inverter, is used for this AC power of on/off; The 1st voltage detection department, it keeps watch on the voltage of above-mentioned AC power; The 2nd voltage detection department, it keeps watch on the voltage of above-mentioned the 2nd DC power supply; And control device, it controls above-mentioned the 1st inverter, above-mentioned the 2nd inverter and above-mentioned diverter switch.Above-mentioned control device obtains the variation in voltage of above-mentioned AC power with respect to reference voltage according to the output of above-mentioned the 1st voltage detection department, with this variation in voltage with compare based on the assigned voltage that determines by the voltage of above-mentioned the 2nd DC power supply that above-mentioned the 2nd voltage detection department detected.Then; When the variation in voltage of above-mentioned AC power is less than or equal to afore mentioned rules voltage; Above-mentioned diverter switch is closed; The bucking voltage that the variation in voltage of above-mentioned AC power is compensated from the output of above-mentioned the 2nd inverter is added on the above-mentioned AC supply voltage this bucking voltage and to above-mentioned load output.In addition, when the variation in voltage of above-mentioned AC power surpasses afore mentioned rules voltage, above-mentioned diverter switch is broken off, the voltage sum of utilizing above-mentioned the 1st inverter and above-mentioned the 2nd inverter to produce is respectively exported to above-mentioned load.
The effect of invention
According to the present invention; Even the voltage change of AC power; Also can the bucking voltage from the 2nd inverter be added on the AC supply voltage, thereby prolong time from stable electric power to load that supply with, reduce the frequency and the time of cutting off AC power and carrying out the reserve running.
Description of drawings
Fig. 1 is the structure chart of the uninterrupted power supply(ups) of the 1st execution mode of the present invention.
Fig. 2 is the figure of switch control part in the control circuit of explanation the 1st execution mode of the present invention.
Fig. 3 is the each several part oscillogram that the action to the uninterrupted power supply(ups) of the 1st execution mode of the present invention describes.
Fig. 4 is the structure chart of the uninterrupted power supply(ups) of the 2nd execution mode of the present invention.
Fig. 5 is the structure chart of the uninterrupted power supply(ups) in another example of the 2nd execution mode of the present invention.
Embodiment
The 1st execution mode.
Below according to the uninterrupted power supply(ups) of description of drawings the 1st execution mode of the present invention.
Fig. 1 (a) is the summary construction diagram of the uninterrupted power supply(ups) of the 1st execution mode of the present invention.
Shown in Fig. 1 (a), be connected the main circuit of the uninterrupted power supply(ups) 3 between single phase alternating current power supply 1 and the single-phase load 2, comprise the 1st inverter 4 and the 2nd inverter 5 that constitute by single-phase inverter respectively.The AC side of the 1st inverter 4 is connected in parallel between AC power 1 and the load 2 with reactor 13 via connecting, and the AC side of the 2nd inverter 5 is connected in series between AC power 1 and the load 2.
1st, the 2nd inverter 4,5 possesses the 1st, the 2nd capacitor 4a, 5a as the 1st, the 2nd DC power supply independent of each other, and the voltage of voltage ratio the 2nd capacitor 5a of the 1st capacitor 4a is high.1st, the 2nd inverter 4,5 is made up of following inverter shown in Fig. 1 (b), that is, and the for example full-bridge inverter that forms by the self-extinction of arc N-type semiconductor N switch elements such as a plurality of MOSFET that are connected with the diode anti-parallel connection.Self-extinction of arc N-type semiconductor N switch element also can be IGBT, GCT, GTO, transistor etc. except MOSFET, even perhaps do not have the thyristor etc. of self-extinction of arc function, as long as can carry out the forced commutation action.
In addition, the 1st capacitor 4a is connected via the insulated type DC/DC transducer 8 that can carry out the bi-directional electric power conversion with the 2nd capacitor 5a, and the 2nd capacitor 5a accepts electric power from the 1st capacitor 4a and supplies with via DC/DC transducer 8, and is controlled to be assigned voltage.The 1st capacitor 4a is connected with the storage battery 10 of outside via charge-discharge circuit 9, from storage battery 10 supply capabilities.
In addition, the 2nd inverter 5 is connected than the 1st inverter 4 more near the position of load 2 one sides, at the load 2 sides configuration reactor 14a and the capacitor 14b of the 2nd inverter 5, formation output filter 14.
In addition, uninterrupted power supply(ups) 3 has diverter switch 6, and the AC side of itself and AC power 1 and the 2nd inverter 5 is connected in series, and is used for AC power 1 cut-off/close.This diverter switch 6 is of the back; Under the situation that AC power 1 takes place to have a power failure; Through these diverter switch 6 disconnections AC power 1 is separated with load 2, being connected in series with reciprocal polarity through 2 thyristor 6c, the 6d that will be connected with diode 6a, 6b anti-parallel connection respectively constitutes.In this case, thyristor 6c, 6d use self-extinction of arc N-type semiconductor N switch elements such as MOSFET, IGBT.
In addition, uninterrupted power supply(ups) 3 has: as the power voltage detecter 11 of the 1st voltage detection department, it is used for the voltage of AC power 1 is kept watch on; As the voltage detector 12 of the 2nd voltage detection department, it is used for the voltage of the 2nd capacitor 5a is kept watch on; And as the control circuit 7 of control device.Be input in the control circuit 7 from the power supply voltage signal 11a of power voltage detecter 11 with from the capacitor voltage signal 12a of voltage detector 12,7 pairs the 1st of control circuits, the 2nd inverter 4,5 and diverter switch 6 are controlled.For the 1st, the 2nd inverter 4,5; Be provided with gate drive circuit (not shown) in each thyristor respectively separately; Reception generates the pulse voltage that is used for applying at the gate pole of thyristor voltage from the signal of the inverter driving circuit (not shown) in the control circuit 7.
Then, the action of uninterrupted power supply(ups) 3 and the control of control circuit 7 are described below.
Fig. 2 is the figure of the switch control part in the expression control circuit 7 diverter switch 6 controlled, and Fig. 3 is the oscillogram of the each several part that describes of the action to uninterrupted power supply(ups) 3.
The supply voltage that is input to the uninterrupted power supply(ups) 3 from AC power 1 is detected by power voltage detecter 11, and the voltage of the 2nd capacitor 5a is then detected by voltage detector 12.Then, be input in the switch control part in the control circuit 7 from the power supply voltage signal 11a of power voltage detecter 11 with from the capacitor voltage signal 12a of voltage detector 12.The switch control part is as shown in Figure 2 to have subtracter 15 and comparator 16; By the variation of subtracter 15 computing supply voltages with respect to the output voltage target waveform that remains reference voltage (export target waveform) 17; And compare through 16 pairs of assigned voltage 18a and power supply voltage variation amounts that determine based on the voltage of the 2nd capacitor 5a of comparator, output is to the switching signal 16a of diverter switch 6.
Be input to assigned voltage 18a in the comparator 16 and be through the magnitude of voltage of capacitor voltage signal 12a being multiply by α and doubly carry out computing by multiplier 18.The ideal value of α is 1, but is set at less than 1 in order to leave surplus, for example 0.9.For comparator 16, when the variation of supply voltage is less than or equal to assigned voltage 18a, the switching signal 16a that output is connected diverter switch 6, when the variation of supply voltage surpasses assigned voltage 18a, the switching signal 16a that output is broken off diverter switch 6.
As shown in Figure 3; If supply voltage begins to descend at t1 constantly; Supply voltage surpasses afore mentioned rules voltage 18a with respect to the variation of export target waveform 17 at t2 constantly, then at t2 the switching signal 16a to diverter switch 6 is switched, and diverter switch 6 becomes disconnection from connection.In this case, 2 thyristor 6c of diverter switch 6,6d connect simultaneously and make circuit turn-on, break off simultaneously and circuit is broken off.
When diverter switch 6 is connected and when being in conducting state, control circuit 7 controls the 2nd inverter 5, the bucking voltage that the variation of supply voltage is compensated with output.As input and receive PWM control, its ac output voltage is that bucking voltage is superimposed upon on the supply voltage and supplies to load 2 to the 2nd inverter 5 with the 2nd capacitor 5a.In addition, the 1st capacitor 4a of the DC side of the 1st inverter 4 discharges and recharges via the 1st inverter 4 from AC power 1.
If diverter switch 6 is broken off and AC power 1 is cut off; Then the AC side of the 1st inverter 4 and the 2nd inverter 5 is connected in series; Control circuit 7 is controlled, to utilize voltage sum that the 1st, the 2nd inverter 4,5 produces separately to the equal voltage of load 2 outputs and export target waveform 17.In this case; Can carry out PWM control to any one of the 1st, the 2nd inverter 4,5; Also can be the voltage output of in the half period, carrying out 1 pulse from the 1st bigger inverter 4 of voltage, and export difference with respect to export target waveform 17 through the 2nd inverter 5 being carried out PWM control.When the reserve running is carried out in AC power 1 cut-out, charge via 9 couples the 1st capacitor 4a of charge-discharge circuit from storage battery 10 as required.
As stated; In this execution mode, the variation in voltage of AC power 1 is compared with the assigned voltage 18a that determines based on the voltage of the 2nd capacitor 5a, if the variation in voltage amount surpasses assigned voltage 18a; Then diverter switch 6 is broken off, thereby cut off AC power 1 and carry out the reserve running.Therefore; As long as suitably set assigned voltage 18a based on the voltage of the 2nd capacitor 5a; Even the supply voltage change, also can the output voltage that can utilize the 2nd inverter 5 compensate during, be added on the supply voltage through output voltage the 2nd inverter 5; And supply with stable electric power to load 2, can avoid carrying out the reserve running.
The 2nd capacitor 5a accepts the electric power supply and is controlled to be assigned voltage via DC/DC transducer 8 from the 1st capacitor 4a; But owing to variation, from the 2nd inverter 5 output voltages, therefore for offset supply voltage; It seems that at short notice voltage can change.Therefore, be redefined for fixing magnitude of voltage, be set at quite low value with regard to considering change in voltage if will be used for the assigned voltage 18a that the variation with supply voltage compares.In the case,, cut off AC power 1, get into the reserve running prematurely thereby diverter switch 6 is broken off even the variation of supply voltage can be compensated by the 2nd inverter 5.
In this execution mode, therefore the voltage decision assigned voltage 18a based on the 2nd capacitor 5a, can more effectively utilize the voltage of the 2nd capacitor 5a.Therefore; Can reduce the frequency and the time of AC power 1 being cut off and carrying out the reserve running; Can prolong the time that is used to from exchanging the electric power of power supply 1, can realize the miniaturization of the 2nd capacitor 5a simultaneously, can also make DC/DC transducer 8 miniaturizations to the 2nd capacitor 5a supply capability.In addition,, therefore can suppress to supply with to the electric power of the 1st capacitor 4a, can suppress the aging of storage battery 10 from storage battery 10 owing to can reduce the frequency and the time of reserve running.
In addition; The on/off of diverter switch 6 is judged and can be accomplished at high speed through control circuit 7; Diverter switch 6 makes 2 the thyristor 6c, the 6d that are connected with diode 6a, 6b anti-parallel connection be connected in series with reciprocal polarity to constitute; Therefore loss is less, can switch at a high speed.Therefore, can supply with stable electric power to load 2 incessantly.
The 2nd execution mode.
Below, Fig. 4 is the summary construction diagram of the uninterrupted power supply(ups) of the 2nd execution mode of the present invention.
In this 2nd execution mode; As shown in Figure 4; In the uninterrupted power supply(ups) 3 of above-mentioned the 1st execution mode, be provided for detecting current detector 19 from the source current of AC power 1; In that diverter switch 6 is connected from AC power 1 to load 2 carry out that electric power supplies with during, the 1st inverter 4 is moved as active filter.Other structures are identical with above-mentioned the 1st execution mode with action.
Common household appliances etc. need be supplied with DC power supply to built-in circuit, thereby will after inner rectification is direct voltage, carry out power supply from the alternating voltage that AC power is supplied with and supply with.The power converter unit uses the rectification circuit that is made up of diode mostly, the additional capacitor that is useful on smooth voltage in order to obtain the little direct voltage of voltage fluctuation (ripple).Making this condenser input type rectification circuit, can make the current direction mains side that comprises high order harmonic component composition with big peak current as under load and the situation that power supply is connected.The electric current that contains the high order harmonic component composition descends because of the power transmission line impedance causes voltage, becomes the reason that causes power supply voltage variation, for example; Under jumbo situation; Also can become the reason that phase advance capacitor is burnt, under the situation of low capacity, become the reason of faults such as circuit breaker misoperation.
Explanation the 1st inverter 4 is as the action of active filter below.
Active filter (the 1st inverter 4) is connected between AC power 1 and the load 2; To stop higher harmonic current to flow to AC power 1; This active filter can be exported the high order harmonic component composition electric current of high order harmonic component offset current to comprise in the load current of offsetting load 2 and being produced; Suppress to contain the current direction mains side of high order harmonic component composition, source current is become do not contain the sine-wave current of high order harmonic component composition.Control circuit 7 is controlled, so that the identical roughly alternating voltage of sine wave of the output of the 1st inverter 4 and AC power 1.Simultaneously, control is from the high order harmonic component offset current of the 1st inverter 4 outputs, and making by current detector 19 detected source currents becomes the sine-wave current that does not contain the high order harmonic component composition.
As stated; In this execution mode; In that diverter switch 6 is connected from AC power 1 to load 2 carry out that electric power supplies with during; Variation in voltage by 5 pairs of AC powers 1 of the 2nd inverter compensates, and produces the high order harmonic component offset current by the 1st inverter 4, to suppress to contain the current direction mains side of high order harmonic component composition.Therefore, can supply with stable electric power, can suppress the fluctuation of supply voltage simultaneously, improve reliability to load 2.
Then; The variation of supply voltage is compared with the assigned voltage 18a that determines based on the voltage of the 2nd capacitor 5a; If the variation of supply voltage has surpassed assigned voltage 18a; Then diverter switch 6 is broken off, thereby cut off AC power 1, likewise carry out the reserve running with above-mentioned the 1st execution mode.
Therefore, ground identical with above-mentioned the 1st execution mode can more effectively utilize the voltage of the 2nd capacitor 5a, the frequency and the time of reducing the reserve running, can prolong the time of utilizing from the electric power of AC power 1.
In addition; In above-mentioned the 1st, the 2nd execution mode; Diverter switch 6 makes 2 the thyristor 6c, the 6d that are connected with diode 6a, 6b anti-parallel connection be connected in series with reciprocal polarity to constitute; But be not limited to this mode, as shown in Figure 5, also can adopt the diverter switch 20 of using mechanical switch to constitute.
In addition, in above-mentioned the 1st, the 2nd execution mode, the 1st, the 2nd inverter 4,5 is made up of 1 single-phase inverter respectively, also can be respectively 1 AC side to a plurality of single-phase inverters to be connected in series and to constitute.
Claims (4)
1. a uninterrupted power supply(ups) is characterized in that,
Have: the 1st inverter, it is connected in parallel between AC power and the load, will be transformed to alternating electromotive force from the direct current power of the 1st DC power supply; The 2nd inverter; It will be transformed to alternating electromotive force from the direct current power of 2nd DC power supply lower than above-mentioned the 1st DC power supply voltage; The AC side of the 2nd inverter, is being connected in series between above-mentioned AC power and this load more on the position near above-mentioned load-side than above-mentioned the 1st inverter; Diverter switch, it is connected in series between the AC side of above-mentioned AC power and above-mentioned the 2nd inverter, is used for this AC power of on/off; The 1st voltage detection department, it keeps watch on the voltage of above-mentioned AC power; The 2nd voltage detection department, it keeps watch on the voltage of above-mentioned the 2nd DC power supply; And control device, it controls above-mentioned the 1st inverter, above-mentioned the 2nd inverter and above-mentioned diverter switch,
Above-mentioned control device,
Output according to above-mentioned the 1st voltage detection department obtains the variation in voltage of above-mentioned AC power with respect to reference voltage; With this variation in voltage with compare based on the assigned voltage that determines by the voltage of above-mentioned the 2nd DC power supply that above-mentioned the 2nd voltage detection department detected
When the variation in voltage of above-mentioned AC power is less than or equal to afore mentioned rules voltage; Above-mentioned diverter switch is closed; The bucking voltage that the variation in voltage of above-mentioned AC power is compensated from the output of above-mentioned the 2nd inverter; Be added on the above-mentioned AC supply voltage this bucking voltage and to above-mentioned load output
When the variation in voltage of above-mentioned AC power surpasses afore mentioned rules voltage, above-mentioned diverter switch to be broken off, the voltage sum of utilizing above-mentioned the 1st inverter and above-mentioned the 2nd inverter to produce is respectively exported to above-mentioned load.
2. uninterrupted power supply(ups) according to claim 1 is characterized in that,
When the variation in voltage of above-mentioned AC power was less than or equal to afore mentioned rules voltage, above-mentioned the 1st DC power supply was accepted electric power from above-mentioned AC power via above-mentioned the 1st inverter and is supplied with,
Above-mentioned the 2nd DC power supply is connected via the DC/DC transducer with above-mentioned the 1st DC power supply, carries out power conversions each other.
3. uninterrupted power supply(ups) according to claim 1 and 2 is characterized in that,
Above-mentioned diverter switch makes 2 thyristors that are connected with the diode anti-parallel connection respectively be connected in series with reciprocal polarity to constitute.
4. uninterrupted power supply(ups) according to claim 1 and 2 is characterized in that,
When the variation in voltage of above-mentioned AC power was less than or equal to afore mentioned rules voltage, above-mentioned control device was controlled above-mentioned the 1st inverter, was used to offset the high order harmonic component offset current of the high order harmonic component that above-mentioned load produced with output.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-178400 | 2007-07-06 | ||
| JP2007178400 | 2007-07-06 | ||
| JP2007178400A JP4669860B2 (en) | 2007-07-06 | 2007-07-06 | Uninterruptible power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101383514A CN101383514A (en) | 2009-03-11 |
| CN101383514B true CN101383514B (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101359321A Expired - Fee Related CN101383514B (en) | 2007-07-06 | 2008-07-03 | Ups device |
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| JP (1) | JP4669860B2 (en) |
| CN (1) | CN101383514B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011055644A (en) * | 2009-09-02 | 2011-03-17 | Toshiba Mitsubishi-Electric Industrial System Corp | Uninterruptible power supply unit |
| WO2011104848A1 (en) * | 2010-02-25 | 2011-09-01 | 三菱電機株式会社 | Power conversion device |
| JP5333867B2 (en) * | 2010-11-15 | 2013-11-06 | 京都電機器株式会社 | Instantaneous voltage drop protection device |
| CN104122461A (en) * | 2013-04-28 | 2014-10-29 | 青岛四方车辆研究所有限公司 | Charger test platform |
| TWI659652B (en) | 2013-08-05 | 2019-05-11 | 新力股份有限公司 | Camera, electronic equipment |
| TWI631854B (en) | 2013-08-05 | 2018-08-01 | 日商新力股份有限公司 | Conversion device, imaging device, electronic device, conversion method |
| JP2015122833A (en) * | 2013-12-20 | 2015-07-02 | 株式会社アドバンスクリエート | Auxiliary power unit |
| JP6441503B2 (en) * | 2015-11-27 | 2018-12-19 | 東芝三菱電機産業システム株式会社 | Uninterruptible power system |
| JP6803526B2 (en) * | 2016-01-27 | 2020-12-23 | パナソニックＩｐマネジメント株式会社 | Motor control device |
| CN106329703B (en) * | 2016-08-23 | 2019-01-22 | 许继集团有限公司 | Concentrate the quick switching-over control and control device of bypass type parallel UPS |
| JP2020028098A (en) | 2018-08-17 | 2020-02-20 | ソニーセミコンダクタソリューションズ株式会社 | Imaging apparatus and electronic apparatus |
| CN109412262A (en) * | 2018-12-28 | 2019-03-01 | 徐州海伦哲特种车辆有限公司 | Small proportion, the hybrid ups power vehicle of multi-functional output and application method |
| KR102547464B1 (en) * | 2019-03-05 | 2023-06-23 | 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 | power unit |
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| CN1273705A (en) * | 1998-08-07 | 2000-11-15 | 松下电器产业株式会社 | Uninterruptible power system |
| CN1748349A (en) * | 2003-10-27 | 2006-03-15 | 三菱电机株式会社 | Power supply apparatus |
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| JP2773213B2 (en) * | 1989-04-03 | 1998-07-09 | 日新電機株式会社 | Instantaneous voltage drop compensator |
| JPH0442740A (en) * | 1990-06-06 | 1992-02-13 | Isao Takahashi | Uninterruptible power supply |
| JP2589799Y2 (en) * | 1991-05-21 | 1999-02-03 | 株式会社三陽電機製作所 | Uninterruptible power system |
| US5808452A (en) * | 1997-09-15 | 1998-09-15 | Gyugyi; Laszlo | Power flow controller with dc-to-dc converter linking shunt and series connected inverters |
| JP2000139083A (en) * | 1998-11-04 | 2000-05-16 | Mitsubishi Electric Corp | Power source voltage adjusting apparatus |
| JP2002252936A (en) * | 2001-02-23 | 2002-09-06 | Fuji Electric Co Ltd | Service interruption detecting circuit for uninterruptible power supply |
| JP2004096831A (en) * | 2002-08-29 | 2004-03-25 | Fuji Electric Fa Components & Systems Co Ltd | Continuous commercial feeding type uninterruptible power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1273705A (en) * | 1998-08-07 | 2000-11-15 | 松下电器产业株式会社 | Uninterruptible power system |
| CN1748349A (en) * | 2003-10-27 | 2006-03-15 | 三菱电机株式会社 | Power supply apparatus |
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Also Published As
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| JP2009017720A (en) | 2009-01-22 |
| CN101383514A (en) | 2009-03-11 |
| JP4669860B2 (en) | 2011-04-13 |
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