JPH09305242A - Power unit - Google Patents

Power unit

Info

Publication number
JPH09305242A
JPH09305242A JP8124273A JP12427396A JPH09305242A JP H09305242 A JPH09305242 A JP H09305242A JP 8124273 A JP8124273 A JP 8124273A JP 12427396 A JP12427396 A JP 12427396A JP H09305242 A JPH09305242 A JP H09305242A
Authority
JP
Japan
Prior art keywords
unit
power supply
voltage
abnormality
data
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.)
Pending
Application number
JP8124273A
Other languages
Japanese (ja)
Inventor
Shoji Hoshi
章二 星
Original Assignee
Fujitsu General Ltd
株式会社富士通ゼネラル
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu General Ltd, 株式会社富士通ゼネラル filed Critical Fujitsu General Ltd
Priority to JP8124273A priority Critical patent/JPH09305242A/en
Publication of JPH09305242A publication Critical patent/JPH09305242A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20Smart grids as enabling technology in buildings sector

Abstract

PROBLEM TO BE SOLVED: To display the state of a fault, etc., on the screen of a computer device, etc., when a protecting function operates owing to abnormality, etc., of a power circuit or load circuit to turn off the power source. SOLUTION: A power source part 3 transforms and rectifies the voltage of a commercial power source 1 to output electric powers A and B, whose voltages are divided by resistors 51 and 52, and 61 and 62; and an abnormality discriminating part 8 compares them with data from a storage part 7. Once abnormality is discriminated, a switch part 2 is driven to cut off the power supply and make a display part 10 illuminate, and data showing the contents of the abnormality are read out of the storage part and sent out from an output part 11 to a personal computer 13 through a signal line 12, so that the contents of the abnormality are displayed on the screen. The abnormality discriminating part, storage part, control part, display part, output, part, etc., operate with the electric power obtained from the commercial power source through the transformation and rectification of the power source part 4.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は電源装置に係り、電
圧の異常を検出し電源を遮断すると共に、通信手段を介
して異常情報を送信し外部の表示装置に表示するものに
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, which detects an abnormal voltage and shuts off the power supply, and at the same time transmits abnormal information via a communication means to display it on an external display device.

【0002】[0002]

【従来の技術】電子機器等に配設される電源装置には非
常保護機能を設け、負荷回路の故障等で供給電圧が許容
ばらつき範囲を越えた場合、非常保護機能を作動させ、
電源の供給を遮断するようにしたものがある。これは、
故障が発生した場合に素早く電源供給を停止し、故障状
態の拡大あるいは他の正常な部分が連鎖的に故障しない
ようにするためであるが、非常保護機能の作動がどの箇
所の故障によるものかが機器の動作が停止してしまうた
め判断できず、原因の判別が困難で修理に手間取り、さ
らには故障箇所の見落とし等により電源投入にて再度故
障する等という問題がある。
2. Description of the Related Art An emergency protection function is provided in a power supply device provided in electronic equipment, etc., and when the supply voltage exceeds an allowable variation range due to a failure of a load circuit or the like, the emergency protection function is activated.
Some have been designed to shut off the power supply. this is,
This is to quickly stop the power supply in the event of a failure so that the failure status does not expand or other normal parts do not cascade, but at which point the operation of the emergency protection function is due to the failure. However, there is a problem that it is difficult to determine the cause because the operation of the device is stopped, it is difficult to determine the cause, it takes time to repair it, and further, the power source is turned on to cause a failure again due to an oversight of a failure location.

【0003】[0003]

【発明が解決しようとする課題】本発明はこのような点
に鑑み、電源回路の異常あるいは負荷回路の異常等によ
り供給電圧がばらつき範囲を越えた場合、電源を遮断
し、非常保護機能の作動を表示灯等により知らせると共
に、この情報を外部に送出し、コンピュータ装置等の画
面に故障の状態等を表示するようにすることにある。
SUMMARY OF THE INVENTION In view of the above problems, the present invention shuts down the power supply and activates the emergency protection function when the supply voltage exceeds the variation range due to the abnormality of the power supply circuit or the abnormality of the load circuit. Is notified by a display lamp or the like, and this information is sent to the outside so that the state of the failure or the like is displayed on the screen of the computer device or the like.

【0004】[0004]

【課題を解決するための手段】本発明は上述の課題を解
決するため、商用電源電圧を変圧・整流し、複数の負荷
回路にそれぞれ直流電圧を供給する第1電源部と、各負
荷回路に供給される電圧値をそれぞれ検出する電圧検出
部と、前記商用電源電圧を変圧・整流し直流電圧を出力
する第2電源部と、第2電源部よりの電圧で動作し、前
記各負荷回路に供給されるべき電圧値に基づくデータを
記憶する第1記憶部と、前記電圧検出部よりのデータを
第1記憶部より読出したデータと比較し異常を判別する
異常判別部と、異常判別部よりのデータに基づき前記第
1電源部への商用電源の供給を遮断するスイッチ部と、
前記異常判別部よりのデータに基づく異常情報を出力す
る出力部とを設け、出力部よりの信号を情報処理装置に
入力し、異常情報を表示するようにした電源装置を提供
するものである。
In order to solve the above-mentioned problems, the present invention provides a first power supply section for transforming / rectifying a commercial power supply voltage and supplying a DC voltage to each of a plurality of load circuits, and each load circuit. A voltage detection unit that detects each of the supplied voltage values, a second power supply unit that transforms and rectifies the commercial power supply voltage and outputs a DC voltage, and operates by the voltage from the second power supply unit, A first storage unit that stores data based on the voltage value to be supplied, an abnormality determination unit that compares the data from the voltage detection unit with the data read from the first storage unit to determine an abnormality, and the abnormality determination unit A switch unit for cutting off the supply of commercial power to the first power source unit based on the data of
An output unit that outputs abnormality information based on data from the abnormality determination unit is provided, and a signal from the output unit is input to the information processing device to display the abnormality information.

【0005】[0005]

【発明の実施の形態】本発明による電源装置では、商用
電源電圧を第1電源部で変圧・整流し、複数の負荷回路
にそれぞれ直流電圧を供給し、各負荷回路に供給される
電圧値を電圧検出部を設けてそれぞれ検出し、前記各負
荷回路に供給されるべき電圧値を第1記憶部を設けて記
憶し、前記電圧検出部よりのデータを第1記憶部より読
出したデータと異常判別部により比較し異常を判別し、
異常判別部よりのデータに基づき前記第1電源部への商
用電源の供給をスイッチ部により遮断し、前記異常判別
部よりのデータに基づき出力部を介し異常情報を出力
し、情報処理装置に入力し、異常の状態を表示する。な
お、商用電源電圧を第2電源部を設けて変圧・整流し直
流電圧を生成し、前記第1記憶部、異常判別部、スイッ
チ部および出力部に供給し動作させる。
BEST MODE FOR CARRYING OUT THE INVENTION In the power supply device according to the present invention, the commercial power supply voltage is transformed and rectified by the first power supply unit, a DC voltage is supplied to each of a plurality of load circuits, and the voltage value supplied to each load circuit is adjusted. A voltage detector is provided to detect each, and a voltage value to be supplied to each of the load circuits is provided and stored in a first memory, and the data from the voltage detector is abnormal with the data read from the first memory. The discriminator compares to determine the abnormality,
The switch unit cuts off the supply of commercial power to the first power supply unit based on the data from the abnormality determination unit, outputs the abnormality information via the output unit based on the data from the abnormality determination unit, and inputs the information to the information processing device. Display the abnormal status. A commercial power supply voltage is provided in the second power supply unit to transform and rectify it to generate a DC voltage, which is supplied to the first storage unit, the abnormality determination unit, the switch unit and the output unit for operation.

【0006】[0006]

【実施例】以下、図面に基づいて本発明による電源装置
の実施例を詳細に説明する。図1は本発明による電源装
置の一実施例の要部ブロック図である。図において、1
は商用電源、2はスイッチ部、3および4は電源部であ
る。スイッチ部2は、制御部9よりの信号にてリレーを
駆動し電源部3への商用電源の供給を遮断するスイッチ
で、電源部3は商用電源電圧を変圧(降圧または昇圧)
し、整流・平滑し、各負荷回路に供給するための直流電
源Aおよび直流電源Bを生成し、電源部4は商用電源電
圧を変圧(降圧)し、整流・平滑し直流電源を生成す
る。51、52、61および62は抵抗器で、電源Aおよび電源
Bの電圧を検出する電圧検出部を構成する。7は記憶部
で、各負荷回路に供給すべき電圧の標準値(電源A、電
源Bの標準値)に基づくデータ、およびそれぞれの許容
ばらつき範囲を記憶すると共に、標準電圧値および異常
の状態、すなわち標準電圧値に対する高低等を表示する
ためのデータを記憶する。8は異常判別部で、電圧検出
部よりのデータ(抵抗器51と52による電源Aの分圧値、
または抵抗器61と62による電源Bの分圧値)を記憶部7
より読出したデータと比較しそれぞれ異常を判別する。
9は制御部で、異常判別部8で異常が判別された場合、
スイッチ部2のリレーを駆動し、スイッチをオフし電源
部3への電源供給を遮断すると共に、表示部10に信号を
出力し、異常の状態に応じて表示灯を点灯し、同時に記
憶部7より読出した異常の内容を示す情報を出力部11よ
り信号線12を介しパソコン(情報処理装置)13に送出す
る。パソコン13は、出力部11よりの情報を処理し、異常
の状態を画面に表示する。
Embodiments of the power supply device according to the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a power supply device according to the present invention. In the figure, 1
Is a commercial power supply, 2 is a switch unit, and 3 and 4 are power supply units. The switch unit 2 is a switch that drives a relay by a signal from the control unit 9 to cut off the supply of commercial power to the power supply unit 3. The power supply unit 3 transforms (compresses or boosts) the commercial power supply voltage.
Then, the DC power supply A and the DC power supply B for rectifying and smoothing and supplying to each load circuit are generated, and the power supply unit 4 transforms (steps down) the commercial power supply voltage and rectifies and smoothes to generate the DC power supply. Reference numerals 51, 52, 61, and 62 are resistors, which form a voltage detection unit that detects the voltages of the power supply A and the power supply B. Reference numeral 7 denotes a storage unit that stores data based on the standard value of the voltage to be supplied to each load circuit (standard values of the power supply A and the power supply B) and the respective allowable variation ranges, and also stores the standard voltage value and the abnormal state, That is, the data for displaying the level of the standard voltage value is stored. Reference numeral 8 denotes an abnormality determination unit, which is data from the voltage detection unit (a divided voltage value of the power supply A by the resistors 51 and 52,
Alternatively, the divided value of the power source B by the resistors 61 and 62) is stored in the storage unit 7.
Compared with the read data, the abnormality is discriminated.
Reference numeral 9 is a control unit, and when an abnormality is determined by the abnormality determination unit 8,
The relay of the switch unit 2 is driven, the switch is turned off to cut off the power supply to the power supply unit 3, the signal is output to the display unit 10, and the indicator lamp is turned on according to the abnormal state, and at the same time, the storage unit 7 The information indicating the details of the read abnormality is sent from the output unit 11 to the personal computer (information processing device) 13 via the signal line 12. The personal computer 13 processes the information from the output unit 11 and displays the abnormal state on the screen.

【0007】次に、本発明による電源装置の動作を説明
する。商用電源1よりの電圧はスイッチ部2を経て電源
部3に入力し、所要の電圧に降圧または昇圧し、整流・
平滑し、あるいは定電圧回路で安定化し、電源Aおよび
電源Bを生成しそれぞれ負荷回路に供給する。この電源
Aの電圧を抵抗器51と抵抗器52とで分圧し、電源Bの電
圧を抵抗器61と抵抗器62とで分圧し、それぞれ電圧検出
信号とし、制御部9に入力する。制御部9は、これらの
信号を異常判別部8に入力し、記憶部7より読出したデ
ータ、すなわち電源Aおよび電源Bに出力すべき電圧に
対応する予め設定されているデータとそれぞれ比較す
る。そして、標準電圧値と一致せず、許容ばらつき範囲
(例えば、電源Aの標準電圧が5Vで許容ばらつき範囲
が±0.3V)を越えた場合、このデータを記憶部7のデー
タ記憶領域に記憶すると共に制御部9よりスイッチ部2
に信号を出力し、リレーを駆動しスイッチをオフし、表
示部10に信号を出力し、LED(発光ダイオード)等を
点灯し、記憶部7より「5Vライン」および「電圧オー
バー」等を表示するためのデータを読出し、出力部11よ
り信号線12を介してパソコン13に送出し、図2の如く画
面に「5Vライン 電圧OVER」等と表示し、また、電源
Bの標準電圧が12V、許容ばらつき範囲が±0.5Vに対
し、実際の電圧が11.5V 以下の場合、上記同様このデー
タを記憶部7のデータ記憶領域に記憶すると共に制御部
9よりスイッチ部2に信号を出力し、リレーを駆動しス
イッチをオフし、表示部10に信号を出力しLED等を点
灯し、記憶部7より「12Vライン」および「電圧低下」
等を表示するためのデータを読出し、出力部11より信号
線12を介してパソコン13に送出し、画面に「12Vライン
電圧低下」等と表示する。
Next, the operation of the power supply device according to the present invention will be described. The voltage from the commercial power source 1 is input to the power source unit 3 via the switch unit 2 to step down or step up to the required voltage for rectification /
The power supply A and the power supply B are generated by smoothing or stabilizing by a constant voltage circuit, and are supplied to the load circuits. The voltage of the power supply A is divided by the resistor 51 and the resistor 52, and the voltage of the power supply B is divided by the resistor 61 and the resistor 62, and they are respectively inputted to the control unit 9 as voltage detection signals. The control unit 9 inputs these signals to the abnormality determination unit 8 and compares them with the data read from the storage unit 7, that is, the preset data corresponding to the voltages to be output to the power supply A and the power supply B, respectively. When it does not match the standard voltage value and exceeds the allowable variation range (for example, the standard voltage of the power supply A is 5 V and the allowable variation range is ± 0.3 V), this data is stored in the data storage area of the storage unit 7. Together with the control unit 9, the switch unit 2
To output the signal, drive the relay to turn off the switch, output the signal to the display unit 10, turn on the LED (light emitting diode), etc., and display "5V line" and "voltage over" from the storage unit 7. The data for reading is read out and sent from the output section 11 to the personal computer 13 through the signal line 12 and displayed as "5V line voltage OVER" on the screen as shown in FIG. 2, and the standard voltage of the power source B is 12V, When the allowable variation range is ± 0.5V and the actual voltage is 11.5V or less, this data is stored in the data storage area of the storage unit 7 as described above, and a signal is output from the control unit 9 to the switch unit 2 for relaying. Drive to turn off the switch, output a signal to the display unit 10 to turn on the LED, etc., and display "12V line" and "voltage drop" from the storage unit 7.
The data for displaying etc. is read out and sent from the output unit 11 to the personal computer 13 via the signal line 12, and "12V line voltage drop" etc. is displayed on the screen.

【0008】[0008]

【発明の効果】以上に説明したように、本発明による電
源装置によれば、電源回路の異常あるいは負荷回路の異
常等で負荷の供給電圧がばらつき範囲を越え、リレーが
作動し電源を遮断した場合、信号線で接続されているパ
ソコン等の画面にどの電圧がどのようになったかを表示
するので、故障原因の解析が容易にでき、的確な修理が
可能になる有効なものである。
As described above, according to the power supply device of the present invention, the supply voltage of the load exceeds the variation range due to the abnormality of the power supply circuit or the abnormality of the load circuit, and the relay operates to shut off the power supply. In this case, since what voltage has become what is displayed on the screen of a personal computer or the like connected by a signal line, the cause of failure can be easily analyzed and accurate repair is possible.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明による電源装置の一実施例の要部ブロッ
ク図である。
FIG. 1 is a block diagram of a main part of an embodiment of a power supply device according to the present invention.

【図2】本発明による電源装置の異常状態の表示の一例
である。
FIG. 2 is an example of a display of an abnormal state of the power supply device according to the present invention.

【符号の説明】[Explanation of symbols]

1 商用電源 2 スイッチ部 3、4 電源部 51、52、61、62 電圧検出部(抵抗器) 7 記憶部 8 異常判別部 9 制御部 11 出力部 13 情報処理装置(パソコン) 1 Commercial power supply 2 Switch section 3, 4 Power supply section 51, 52, 61, 62 Voltage detection section (resistor) 7 Storage section 8 Abnormality determination section 9 Control section 11 Output section 13 Information processing device (personal computer)

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H02J 13/00 301 H02J 13/00 301C ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location H02J 13/00 301 H02J 13/00 301C

Claims (6)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 商用電源電圧を変圧・整流し、複数の負
    荷回路にそれぞれ直流電圧を供給する第1電源部と、各
    負荷回路に供給される電圧値をそれぞれ検出する電圧検
    出部と、前記商用電源電圧を変圧・整流し直流電圧を出
    力する第2電源部と、第2電源部よりの電圧で動作し、
    前記各負荷回路に供給されるべき電圧値に基づくデータ
    を記憶する第1記憶部と、前記電圧検出部よりのデータ
    を第1記憶部より読出したデータと比較し異常を判別す
    る異常判別部と、異常判別部よりのデータに基づき前記
    第1電源部への商用電源の供給を遮断するスイッチ部
    と、前記異常判別部よりのデータに基づく異常情報を出
    力する出力部とを設け、出力部よりの信号にて異常情報
    を表示するようにした電源装置。
    1. A first power supply unit that transforms and rectifies a commercial power supply voltage to supply a DC voltage to each of a plurality of load circuits, a voltage detection unit that detects a voltage value supplied to each load circuit, and A second power supply unit that transforms and rectifies the commercial power supply voltage and outputs a DC voltage, and operates with the voltage from the second power supply unit,
    A first storage unit that stores data based on the voltage value to be supplied to each load circuit; and an abnormality determination unit that compares the data from the voltage detection unit with the data read from the first storage unit to determine an abnormality. A switch unit for shutting off the supply of commercial power to the first power supply unit based on the data from the abnormality determination unit; and an output unit for outputting abnormality information based on the data from the abnormality determination unit. Power supply device that displays abnormal information by the signal of.
  2. 【請求項2】 前記出力部よりの信号を情報処理装置に
    入力し、画面に異常情報を表示するようにした請求項1
    記載の電源装置。
    2. The information processing apparatus inputs a signal from the output unit to display abnormality information on a screen.
    The power supply as described.
  3. 【請求項3】 前記第1記憶部は、各負荷回路に供給さ
    れるべき電圧の標準値および許容ばらつき範囲を記憶
    し、前記異常判別部にて、前記電圧検出部よりのデータ
    を第1記憶部より読出したデータと比較し、許容ばらつ
    き範囲を越えた場合に異常を判別するようにした請求項
    1または請求項2記載の電源装置。
    3. The first storage unit stores a standard value and an allowable variation range of the voltage to be supplied to each load circuit, and the abnormality determination unit first stores the data from the voltage detection unit. The power supply device according to claim 1 or 2, wherein an abnormality is discriminated when compared with the data read from the unit and when the allowable variation range is exceeded.
  4. 【請求項4】 前記第1記憶部は、各負荷回路に供給さ
    れるべき電圧の標準値および許容ばらつき範囲と共に、
    標準電圧値および異常の内容を示すデータを記憶し、前
    記異常判別部にて異常を判別した場合に第1記憶部より
    相応するデータを読出し、前記出力部を介し前記情報処
    理装置に入力し表示するようにした請求項3記載の電源
    装置。
    4. The first storage section, together with a standard value and an allowable variation range of a voltage to be supplied to each load circuit,
    The standard voltage value and the data indicating the content of the abnormality are stored, and when the abnormality is determined by the abnormality determination unit, the corresponding data is read from the first storage unit and input to the information processing device via the output unit and displayed. The power supply device according to claim 3, wherein
  5. 【請求項5】 前記スイッチ部の遮断直前の前記異常判
    別部よりのデータを記憶する第2記憶部を設け、第2記
    憶部より読出したデータに基づき前記出力部より異常情
    報を出力するようにした請求項1、請求項2、請求項3
    または請求項4記載の電源装置。
    5. A second storage unit is provided for storing data from the abnormality determination unit immediately before the switch unit is shut off, and abnormality information is output from the output unit based on the data read from the second storage unit. Claim 1, Claim 2, Claim 3
    Alternatively, the power supply device according to claim 4.
  6. 【請求項6】 前記情報処理装置は、異常情報に基づき
    標準電圧および標準電圧からの高低を表示するようにし
    た請求項1、請求項2、請求項3、請求項4または請求
    項5記載の電源装置。
    6. The information processing apparatus according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the information processing apparatus displays the standard voltage and the level of the standard voltage based on the abnormality information. Power supply.
JP8124273A 1996-05-20 1996-05-20 Power unit Pending JPH09305242A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8124273A JPH09305242A (en) 1996-05-20 1996-05-20 Power unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8124273A JPH09305242A (en) 1996-05-20 1996-05-20 Power unit

Publications (1)

Publication Number Publication Date
JPH09305242A true JPH09305242A (en) 1997-11-28

Family

ID=14881264

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8124273A Pending JPH09305242A (en) 1996-05-20 1996-05-20 Power unit

Country Status (1)

Country Link
JP (1) JPH09305242A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007264767A (en) * 2006-03-27 2007-10-11 Fujitsu Ltd Power supply monitoring apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007264767A (en) * 2006-03-27 2007-10-11 Fujitsu Ltd Power supply monitoring apparatus

Similar Documents

Publication Publication Date Title
US8937405B2 (en) Data center using fuel cells in place of diesel generators for backup power
JP4053501B2 (en) Motor drive device
US6711512B2 (en) Pole transformer load monitoring system using wireless internet network
US6751561B2 (en) Power saving method and apparatus for a portable appliance
JP3696885B2 (en) Two-terminal line voltage thermostat
US5519832A (en) Method and apparatus for displaying module diagnostic results
US5327435A (en) Method for testing a processor module in a computer system
US6170062B1 (en) Fault detection on dual supply system for a universal serial bus system
US4675538A (en) General purpose uninterruptible power supply
US8159361B2 (en) Methods and apparatus for providing power to a notification appliance circuit
US4428020A (en) Power supply sensing circuitry
US4595872A (en) Computer-attached uninterruptable DC power supply
US5886424A (en) Power supply apparatus for portable computer and DC input selection circuit adapted to the same
US6847130B1 (en) Uninterruptible power system
US4663539A (en) Local power switching control subsystem
AU2010274972B2 (en) Direct tie-in of a backup power source to motherboards in a server system
US6795302B2 (en) Method and system to determine external power available and fault states
US6541879B1 (en) USB hub power management
US7243246B2 (en) System having a power adapter that generates a data signal based on the state of a external power source that is used to manage the power consumption of a CPU
US7159132B2 (en) USB device that provides power that is different from power prescribed in the USB standard
US20090085547A1 (en) Switching Power Supply Unit
KR20120026829A (en) Luminescence driving apparatus, display apparatus and driving method thereof
US8648494B2 (en) Uninterruptible power supply and method of energy saving thereof
EP0656578A2 (en) Portable computer system
US5790430A (en) Variable speed fan failure detector