JP2000224779A - Uninterruptible power supply - Google Patents
Uninterruptible power supplyInfo
- Publication number
- JP2000224779A JP2000224779A JP11025605A JP2560599A JP2000224779A JP 2000224779 A JP2000224779 A JP 2000224779A JP 11025605 A JP11025605 A JP 11025605A JP 2560599 A JP2560599 A JP 2560599A JP 2000224779 A JP2000224779 A JP 2000224779A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- voltage
- commercial power
- load
- storage battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、常時商用給電方式
による無停電電源装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply system using a constant commercial power supply system.
【０００２】[0002]
【従来の技術】従来使用されていた常時商用給電方式の
無停電電源装置は図７に示すブロック図の回路であり、
図８に示す状況で作動していた。すなわち、商用電源1
から無停電電源装置への入力電圧が90〜110Vの範囲（図
８、領域（Ｂ））では、商用電源1の電圧はバイパスラ
イン14を通って、そのまま出力して負荷9に給電し、商
用電源1からの入力電圧が90V以下（図８、領域（Ａ））
または110V以上（図８、領域（Ｃ））の場合には、商用
電源1からの給電を停止して、鉛蓄電池5を電源とするイ
ンバータ3の運転により負荷9に給電する方式を用いてい
た。2. Description of the Related Art An uninterruptible power supply unit of the conventional commercial power supply type conventionally used is a circuit shown in a block diagram of FIG.
It was operating in the situation shown in FIG. That is, commercial power 1
When the input voltage to the uninterruptible power supply is in the range of 90 to 110 V (FIG. 8, area (B)), the voltage of the commercial power supply 1 passes through the bypass line 14 and is output as it is to supply the load 9 Input voltage from power supply 1 is 90V or less (Fig. 8, area (A))
Or, in the case of 110 V or more (FIG. 8, area (C)), the method of stopping the power supply from the commercial power supply 1 and supplying power to the load 9 by operating the inverter 3 using the lead storage battery 5 as the power supply has been used. .
【０００３】前記したように、従来の常時商用給電方式
の無停電電源装置では、商用電源１の電圧が９０〜110V
の範囲にない場合には、鉛蓄電池5を放電させて負荷9に
電力を供給していた。そして、商用電源1の電圧が回復
し、電圧が安定したのを確認した後に、バイパスライン
14を通って負荷9に出力するとともに、充電器4を用いて
鉛蓄電池5を充電していた。すなわち、入力電圧が90V以
下又は110V以上の時間が、きわめて短時間であっても、
商用電源1の電圧が安定するのを確認するまでは鉛蓄電
池5によって電力を供給する必要があった。そして、鉛
蓄電池5の充放電が繰り返されると、その寿命が短くな
る。したがって、短期間に鉛蓄電池5の交換が必要にな
るという問題点があった。なお、実際に商用電源1の電
圧の変動を測定したところ、80V以下になる場合や125V
を超える場合は、きわめて少ないことが明らかになっ
た。As described above, in the conventional uninterruptible power supply of the always-on commercial power supply system, the voltage of the commercial power
If not, the lead storage battery 5 is discharged to supply power to the load 9. After confirming that the voltage of the commercial power supply 1 has recovered and the voltage has stabilized, the bypass line
The battery 9 was output to the load 9 through 14 and the lead-acid battery 5 was charged using the charger 4. That is, even if the input voltage is 90 V or less or 110 V or more, even if the time is extremely short,
Until it was confirmed that the voltage of the commercial power supply 1 was stabilized, power had to be supplied by the lead storage battery 5. When the charge and discharge of the lead storage battery 5 are repeated, the life thereof is shortened. Therefore, there is a problem that the lead storage battery 5 needs to be replaced in a short time. In addition, when the fluctuation of the voltage of the commercial power supply 1 was actually measured,
It is clear that the number is extremely small when it exceeds.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、商用
電源1による負荷9への給電が可能な電圧範囲を拡張する
ことによって、鉛蓄電池5の充放電回数を低減し、その
結果、鉛蓄電池5の長寿命化をはかることを目的とする
ものである。SUMMARY OF THE INVENTION An object of the present invention is to reduce the number of times the lead-acid battery 5 is charged and discharged by expanding the voltage range in which the commercial power supply 1 can supply power to the load 9, and as a result The purpose is to extend the life of the storage battery 5.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、第一の発明は交流電力を直流電力に変換するコンバ
ータ、直流電力を交流電力に変換するインバータ、イン
バータに直流電力を供給する蓄電池、蓄電池の充電器及
び負荷への給電方式を切り換えるスイッチ回路を有する
無停電電源装置において、前記商用電源の電圧監視回路
と前記インバータの起動及び停止、スイッチ回路の切り
換え行う制御回路部を備えており、該制御回路部は、前
記商用電源の電圧が許容範囲内の場合には該商用電源の
電圧を負荷へ給電するように制御し、前記商用電源の電
圧が許容電圧範囲を下回った場合にはトランスを用いて
商用電源の電圧を昇圧して負荷へ給電するように制御す
るものであることを特徴しており、第二の発明は前記ト
ランスは、３個の巻き線を有するものであることを特徴
としている。In order to solve the above problems, a first invention is a converter for converting AC power to DC power, an inverter for converting DC power to AC power, and a storage battery for supplying DC power to the inverter. An uninterruptible power supply device having a switch circuit for switching a power supply method to a battery charger and a load, comprising a voltage monitoring circuit for the commercial power supply, a control circuit for starting and stopping the inverter, and switching the switch circuit. The control circuit controls the power supply of the commercial power supply to a load when the voltage of the commercial power supply is within an allowable range, and when the voltage of the commercial power supply falls below the allowable voltage range. The second invention is characterized in that the voltage of a commercial power supply is boosted using a transformer and is controlled so as to supply power to a load. It is characterized in that with a feeder.
【０００６】[0006]
【発明の実施の形態】本発明による常時商用給電方式の
一実施例である無停電電源装置のブロック図を図１に示
す。この装置は、交流電力を直流電力に変換するコンバ
ータ2、直流電力を交流電力に変換するインバータ3、イ
ンバータ3に直流電力を供給する鉛蓄電池5、鉛蓄電池5
の充電器4、ダイオード6、トランス7、スイッチ回路8、
商用電源1の電圧監視回路10、インバータ3及びスイッチ
回路制御部11、制御回路部12などで構成されている。な
おスイッチ回路8は、後述するように商用電源1の交流電
圧に応じて、ａ）商用電源1からの電圧をバイパスライ
ン14を通ってそのまま負荷9へ出力する、ｂ）商用電源1
からの電圧をトランス7を介して昇圧して負荷9へ出力す
る、ｃ）商用電源1からの電圧をトランス7を介して降圧
して負荷9へ出力する、などそれぞれの場合において、
その切り換えをする回路である。制御回路部１2は、商
用電源1の電圧変動を監視する電圧監視回路10とインバ
ータ3及びスイッチ回路制御部11より構成される。FIG. 1 is a block diagram of an uninterruptible power supply according to one embodiment of the present invention. This device includes a converter 2 for converting AC power to DC power, an inverter 3 for converting DC power to AC power, a lead storage battery 5 for supplying DC power to the inverter 3, a lead storage battery 5
Charger 4, diode 6, transformer 7, switch circuit 8,
It comprises a voltage monitoring circuit 10 of the commercial power supply 1, an inverter 3, a switch circuit control unit 11, a control circuit unit 12, and the like. The switch circuit 8 outputs a voltage from the commercial power supply 1 to the load 9 as it is through the bypass line 14 according to the AC voltage of the commercial power supply 1 as described later.
From the power supply 1 through the transformer 7 and output to the load 9; c) the voltage from the commercial power supply 1 is reduced through the transformer 7 and output to the load 9;
This is a circuit for switching. The control circuit unit 12 includes a voltage monitoring circuit 10 for monitoring voltage fluctuations of the commercial power supply 1, an inverter 3, and a switch circuit control unit 11.
【０００７】本発明による常時商用給電方式の無停電電
源装置は、図２に示す作動をする。すなわち、商用電源
1の電圧が90〜110Vの範囲（領域（３））では、商用電
源1からの電圧をバイパスライン14を通ってそのまま負
荷9に出力する。商用電源1の電圧が80V以下（領域
（１））及び125V以上（領域（５））の場合には、鉛蓄
電池5を電源として用いてインバータ3を運転し、インバ
ータ3の出力電圧をトランス7により昇圧して負荷9に出
力する。商用電源1の電圧が80〜90V（領域（２））の場
合には、商用電源1の電圧をトランス7を用いて昇圧して
負荷9に出力する。また、商用電源1の電圧が110〜125V
（領域（４））の場合には、商用電源1の電圧をトラン
ス7で降圧して負荷9に出力する。The uninterruptible power supply of the always commercial power supply system according to the present invention operates as shown in FIG. That is, commercial power
When the voltage of 1 is in the range of 90 to 110 V (region (3)), the voltage from the commercial power supply 1 is output to the load 9 as it is via the bypass line 14. When the voltage of the commercial power supply 1 is 80 V or less (area (1)) and 125 V or more (area (5)), the inverter 3 is operated using the lead storage battery 5 as a power supply, and the output voltage of the inverter 3 is And output to the load 9. When the voltage of the commercial power supply 1 is 80 to 90 V (region (2)), the voltage of the commercial power supply 1 is boosted using the transformer 7 and output to the load 9. Also, the voltage of commercial power supply 1 is 110-125V
In the case of (region (4)), the voltage of the commercial power supply 1 is stepped down by the transformer 7 and output to the load 9.
【０００８】本発明を用いると、鉛蓄電池5を放電させ
て電力を供給するのは、商用電源1の電圧が80V以下の場
合（領域（１））及び125V以上（領域（５））の場合の
みとすることができる。商用電源1の電圧が80V以下や12
5V以上になる場合は、前記したようにきわめて少ないた
め、図７、８に示した従来の方法に比べて鉛蓄電池５の
充放電回数を少なくできる。その結果、鉛蓄電池５の交
換時期を長くすることができる。According to the present invention, power is supplied by discharging the lead storage battery 5 when the voltage of the commercial power supply 1 is 80 V or less (region (1)) and when the voltage of the commercial power supply 1 is 125 V or more (region (5)). It can only be. If the voltage of commercial power supply 1 is
When the voltage is 5 V or more, the number of charge / discharge of the lead storage battery 5 can be reduced as compared with the conventional method shown in FIGS. As a result, the replacement time of the lead storage battery 5 can be lengthened.
【０００９】[0009]
【実施例】以下に、本発明の一実施例を詳細に示す。図
１に示した本発明の無停電電源装置は、商用電源1の電
圧に依存して動作することを特徴としている。なお、本
発明では、図３に示すような３個の巻線（巻線１〜３）
を有する１個のトランス7を用いて、商用電源1の電圧の
昇圧または降圧を行うことを特徴としている。そこで、
それぞれの商用電源1の電圧の領域に応じたトランス7の
使用状態について図４〜６を用いて解説する。なお、図
４〜６は説明の便宜上、スイッチ回路８で切り替えられ
た後の要部のみを示す。An embodiment of the present invention will be described below in detail. The uninterruptible power supply of the present invention shown in FIG. 1 is characterized in that it operates depending on the voltage of the commercial power supply 1. In the present invention, three windings (windings 1 to 3) as shown in FIG.
The voltage of the commercial power supply 1 is stepped up or down using one transformer 7 having Therefore,
The use state of the transformer 7 according to the voltage range of the commercial power supply 1 will be described with reference to FIGS. 4 to 6 show only main parts after being switched by the switch circuit 8 for convenience of explanation.
【００１０】・商用電源1の電圧：90〜110Vの範囲（図
１） 商用電源1の電圧が90〜110Vの範囲では、スイッチ回路8
を切り換えて、商用電源1の電力をそのままバイパスラ
イン14を通して負荷9に出力する。The voltage of the commercial power supply 1 is in the range of 90 to 110 V (FIG. 1).
To output the power of the commercial power supply 1 to the load 9 through the bypass line 14 as it is.
【００１１】・商用電源1の電圧：80V以下又は125V以上
の範囲（図４） 商用電源1の電圧が80V以下又は125V以上の範囲では、商
用電源1からの入力をＯＦＦとし、鉛蓄電池5を電源とし
てインバータ3を作動させて、電力をトランス7の巻線
（１）に供給し、巻線（２）と巻線（３）を直列に接続
して100Vの交流を負荷9に出力する。Voltage of commercial power supply 1: range of 80 V or less or 125 V or more (FIG. 4) When the voltage of commercial power supply 1 is 80 V or less or 125 V or more, input from commercial power supply 1 is turned off and lead-acid battery 5 is By operating the inverter 3 as a power supply, power is supplied to the winding (1) of the transformer 7, and the winding (2) and the winding (3) are connected in series to output a 100 V AC to the load 9.
【００１２】・商用電源1の電圧：80〜90Vの範囲（図
５） 商用電源1の電圧が80〜90Vの範囲では図５に示すよう
に、昇圧運転をする。すなわち、80〜90Vの商用電源1は
トランス7の巻線（３）に供給し、巻線（１）から100〜
113Vの交流電圧を負荷9に出力する。なお、この商用電
源1の電圧範囲において鉛蓄電池5は放電しない。The voltage of the commercial power supply 1 is in the range of 80 to 90 V (FIG. 5) When the voltage of the commercial power supply 1 is in the range of 80 to 90 V, the boost operation is performed as shown in FIG. In other words, the commercial power supply 1 of 80 to 90 V is supplied to the winding (3) of the transformer 7, and 100 to 100 V from the winding (1).
Output 113V AC voltage to load 9. Note that the lead storage battery 5 does not discharge in the voltage range of the commercial power supply 1.
【００１３】・商用電源1の電圧：110〜125Vの範囲 商用電源1の電圧が110〜125Vの範囲では図６に示すよう
に、降圧運転をする。すなわち、商用電源1からの電圧
をトランス7の巻線（２）と巻線（３）を直列に接続し
たものに供給し、巻線（２）から95〜108Vの交流を負荷
9に出力する。なお、この商用電源1の電圧範囲において
鉛蓄電池5は放電しない。The voltage of the commercial power supply 1 is in the range of 110 to 125 V When the voltage of the commercial power supply 1 is in the range of 110 to 125 V, the step-down operation is performed as shown in FIG. That is, the voltage from the commercial power supply 1 is supplied to the transformer 7 in which the winding (2) and the winding (3) are connected in series, and an AC of 95 to 108 V is applied from the winding (2) to the load.
Output to 9. Note that the lead storage battery 5 does not discharge in the voltage range of the commercial power supply 1.
【００１４】従来の無停電電源装置では商用電源1の電
圧が90〜110Vの範囲のみ、商用電源1の電圧をそのまま
出力し、商用電源1の電圧が90V以下及び110V以上の範囲
では、鉛蓄電池5を電源として用いたインバータ3給電に
よるものであった。これに対して、本発明品では商用電
源1の電圧が80V以下及び125Vの以上の範囲にのみ、鉛蓄
電池5を用いたインバータ3給電となるため、鉛蓄電池5
の充放電頻度をきわめて少なくできる。なお、本実施例
では、非常用電源として鉛蓄電池5を用いた例を示した
が、ニッケルカドミウム電池やニッケル水素電池など他
の蓄電池でも同様な効果が認められる。In the conventional uninterruptible power supply, the voltage of the commercial power supply 1 is directly output only in the range of 90 to 110 V when the voltage of the commercial power supply 1 is 90 V or less and 110 V or more. It was powered by an inverter 3 using 5 as a power source. On the other hand, in the product of the present invention, the inverter 3 is supplied with the lead storage battery 5 only when the voltage of the commercial power supply 1 is in the range of 80 V or less and 125 V or more.
Can be extremely reduced in charge and discharge frequency. In the present embodiment, an example in which the lead storage battery 5 is used as the emergency power supply is shown, but similar effects can be obtained with other storage batteries such as a nickel cadmium battery and a nickel hydride battery.
【００１５】[0015]
【発明の効果】上述したように、本発明に係る無停電電
源装置は、３個の巻線を有するトランス7を用いて商用
電源1の電圧を、昇圧または降圧するものである。本発
明を用いると、従来の無停電電源装置に比べて蓄電池の
充放電頻度が少なくでき、蓄電池を長寿命化できるた
め、蓄電池の交換頻度を少なくでき、使用時のコスト低
減が可能になる点で優れている。As described above, the uninterruptible power supply according to the present invention raises or lowers the voltage of the commercial power supply 1 using the transformer 7 having three windings. When the present invention is used, the frequency of charging and discharging the storage battery can be reduced as compared with the conventional uninterruptible power supply device, and the life of the storage battery can be extended, so the frequency of replacing the storage battery can be reduced, and the cost during use can be reduced. Is excellent.
【図１】本発明の無停電電源装置のブロック図である。FIG. 1 is a block diagram of an uninterruptible power supply according to the present invention.
【図２】本発明の無停電電源装置の入力電圧と出力電圧
の関係図である。FIG. 2 is a diagram illustrating a relationship between an input voltage and an output voltage of the uninterruptible power supply of the present invention.
【図３】本発明に使用したトランスの巻線構造である。FIG. 3 shows a winding structure of a transformer used in the present invention.
【図４】商用電源の電圧が80V以下または125V以上での
動作回路の概略図である。FIG. 4 is a schematic diagram of an operation circuit when the voltage of a commercial power supply is 80 V or less or 125 V or more.
【図５】商用電源の電圧が80〜90Vでの動作回路の概略
図である。FIG. 5 is a schematic diagram of an operation circuit when the voltage of a commercial power supply is 80 to 90V.
【図６】商用電源の電圧が110〜125Vでの動作回路の概
略図である。FIG. 6 is a schematic diagram of an operation circuit when the voltage of a commercial power supply is 110 to 125V.
【図７】従来の無停電電源装置のブロック図である。FIG. 7 is a block diagram of a conventional uninterruptible power supply.
【図８】従来の無停電電源装置の入力電圧と出力電圧の
関係図である。FIG. 8 is a diagram showing a relationship between an input voltage and an output voltage of a conventional uninterruptible power supply.
１：商用電源、 ２：コンバータ、 ３：インバータ、
４：充電器、５：鉛蓄電池、 ６：ダイオード、 ７：ト
ランス、 ８：スイッチ回路、９：負荷、 １０：電圧監
視回路、 １１：インバータ及びスイッチ回路制御部 １２：制御回路部、 １３：出力、 １４：バイパスライ
ン1: commercial power supply, 2: converter, 3: inverter,
4: charger, 5: lead storage battery, 6: diode, 7: transformer, 8: switch circuit, 9: load, 10: voltage monitoring circuit, 11: inverter and switch circuit control unit 12, control circuit unit, 13: output , 14: Bypass line
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5G015 FA06 GA06 HA03 HA04 HA11 JA01 JA10 JA11 JA21 JA34 JA53 JA55 5G066 DA01 LA08 5H030 AA06 AS03 BB01 BB21 BB26 DD12 FF43 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G015 FA06 GA06 HA03 HA04 HA11 JA01 JA10 JA11 JA21 JA34 JA53 JA55 5G066 DA01 LA08 5H030 AA06 AS03 BB01 BB21 BB26 DD12 FF43
Claims (2)
タ、直流電力を交流電力に変換するインバータ、インバ
ータに直流電力を供給する蓄電池、蓄電池の充電器及び
負荷への給電方式を切り換えるスイッチ回路を有する無
停電電源装置において、前記商用電源の電圧監視回路と
前記インバータの起動及び停止、スイッチ回路の切り換
え行う制御回路部を備えており、該制御回路部は、前記
商用電源の電圧が許容範囲内の場合には該商用電源の電
圧を負荷へ給電するように制御し、前記商用電源の電圧
が許容電圧範囲を下回った場合にはトランスを用いて商
用電源の電圧を昇圧して負荷へ給電するように制御する
ものであることを特徴とする無停電電源装置。1. A converter for converting AC power to DC power, an inverter for converting DC power to AC power, a storage battery for supplying DC power to the inverter, and a switch circuit for switching a power supply method to a battery charger and a load. The uninterruptible power supply device includes a voltage monitoring circuit for the commercial power supply and a control circuit unit for starting and stopping the inverter and switching a switch circuit, wherein the control circuit unit has a voltage of the commercial power supply within an allowable range. In such a case, the voltage of the commercial power supply is controlled to be supplied to the load, and when the voltage of the commercial power supply falls below the allowable voltage range, the voltage of the commercial power supply is boosted using a transformer to supply the load. An uninterruptible power supply, characterized in that the power supply is controlled in the following manner.
のであることを特徴とする請求項１記載の無停電電源装
置。2. The uninterruptible power supply according to claim 1, wherein said transformer has three windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11025605A JP2000224779A (en) | 1999-02-03 | 1999-02-03 | Uninterruptible power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11025605A JP2000224779A (en) | 1999-02-03 | 1999-02-03 | Uninterruptible power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000224779A true JP2000224779A (en) | 2000-08-11 |
Family
ID=12170545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11025605A Abandoned JP2000224779A (en) | 1999-02-03 | 1999-02-03 | Uninterruptible power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000224779A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007202241A (en) * | 2006-01-24 | 2007-08-09 | Nippon Telegr & Teleph Corp <Ntt> | Power supply system, program for controlling power supply system, and recording medium stored with the program |
| WO2008040225A1 (en) * | 2006-09-18 | 2008-04-10 | Byd Company Limited | Electric vehicle charging system |
| US8543018B2 (en) | 2008-08-01 | 2013-09-24 | Ricoh Company, Limited | Image forming apparatus and power-supply control method |
| CN108075564A (en) * | 2017-12-27 | 2018-05-25 | 佛山市众盈电子有限公司 | A kind of selectable off-grid type UPS |
-
1999
- 1999-02-03 JP JP11025605A patent/JP2000224779A/en not_active Abandoned
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007202241A (en) * | 2006-01-24 | 2007-08-09 | Nippon Telegr & Teleph Corp <Ntt> | Power supply system, program for controlling power supply system, and recording medium stored with the program |
| JP4519077B2 (en) * | 2006-01-24 | 2010-08-04 | 日本電信電話株式会社 | Power supply system, power supply system control program, and recording medium recording the same |
| WO2008040225A1 (en) * | 2006-09-18 | 2008-04-10 | Byd Company Limited | Electric vehicle charging system |
| US7768229B2 (en) | 2006-09-18 | 2010-08-03 | Byd Company Limited | Electric car charging systems |
| US8543018B2 (en) | 2008-08-01 | 2013-09-24 | Ricoh Company, Limited | Image forming apparatus and power-supply control method |
| CN108075564A (en) * | 2017-12-27 | 2018-05-25 | 佛山市众盈电子有限公司 | A kind of selectable off-grid type UPS |
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