JP2004215352A - Fail-safe control system at the time of abnormal power supply voltage - Google Patents

Fail-safe control system at the time of abnormal power supply voltage Download PDF

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JP2004215352A
JP2004215352A JP2002380028A JP2002380028A JP2004215352A JP 2004215352 A JP2004215352 A JP 2004215352A JP 2002380028 A JP2002380028 A JP 2002380028A JP 2002380028 A JP2002380028 A JP 2002380028A JP 2004215352 A JP2004215352 A JP 2004215352A
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power supply
supply voltage
unit
voltage
functional
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Japanese (ja)
Inventor
Kota Nakazato
功太 中里
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Fujitsu Ltd
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Fujitsu Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a fail-safe control system at the time of abnormal power supply voltage in which damage on the hardware is minimized at each functional section in an electronic apparatus upon occurrence of an abnormal power supply voltage and the hardware at other functional sections in the electronic apparatus is not damaged. <P>SOLUTION: A power supply generating section 2 has a plurality of power supply voltage generating sections 22(V1-Vi) supplying a plurality of voltages to respective functional sections 1(#1-#N) through wiring of independent systems. When a voltage monitoring section 11 monitoring each power supply voltage detects an abnormal power supply voltage, each functional section 1(#1-#N) delivers a signal for informing an abnormal state to the power supply generating section 2. Upon receiving the signal for informing an abnormal state, the state monitoring section 21 in the power supply generating section 2 controls each voltage generating section 22(V1-Vi) to interrupt supply of all power supply voltages only to a functional section from where the signal for informing an abnormal state was delivered. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、電源電圧異常時のフェイルセーフ制御方式に関する。近年、電子式装置に実装されるハードウエアには、複数の異なる電源電圧を使用するものが多数存在する。本発明は、そのようなハードウエアを用いた複数の機能部から構成される電子式装置における電源電圧異常時のフェイルセーフ制御方式に関する。
【０００２】
【従来の技術】
図３は従来の集中給電方式の電子式装置を示す。同図に示すように、集中給電方式の電子式装置は、複数の異なる電源電圧を使用する各機能部１（＃１〜＃Ｎ）へ、一つの電源部３から集中給電を行う。各機能部１（＃１〜＃Ｎ）には、給電される電圧を監視する電圧監視部１１をそれぞれ備える。
【０００３】
このような電子式装置において、或る機能部１（＃ｋ）（１≦ｋ≦Ｎ）が、その電圧監視部１１により、自身への電源電圧の少なくとも一つが異常であることを検出すると、その異常状態を上位の装置制御部４へ通知し、切り離し要求を行う。
【０００４】
上位の装置制御部４は、機能部１（＃ｋ）からの電圧異常の通知を受けると、該機能部１（＃ｋ）に対して、その機能を停止させ、機能的に該機能部１（＃ｋ）を切り離す制御を行う。こうすることにより、電子式装置全体が異常動作又は誤動作状態に陥るのを防いでいる。
【０００５】
そのほか、電源異常に対する先行技術として、下記の特許文献１に記載された「電源異常検出方式」がある。この「電源異常検出方式」は、フューズ断検出手段及び内部電源電圧異常検出手段等を備え、電源ユニット障害か、フューズ抜け又はコネクタの接続不良かを判別することができるようにしたものでる。
【特許文献１】
特許第２６４７６６３号公報
【０００６】
【発明が解決しようとする課題】
図３に示した従来技術のように、機能部１（＃ｋ）からの電圧異常の通知を受けると、機能的に該機能部１（＃ｋ）を切り離すフェイルセーフ制御方式において、該機能部１（＃ｋ）が複数の電源電圧によって駆動されるハードウエア構成の場合、他の正常状態の電源電圧は供給され続けるため、一部のハードウェア回路には正常に電源電圧が供給され、他の一部のハードウェア回路には異常な電源電圧が供給され続ける。
【０００７】
その結果、最悪の場合は、当該機能部１（＃ｋ）のハードウエア及びそれに付随する周辺のハードウエアが破損する恐れがある。つまり、電源電圧のみの異常に留まらず、負荷側のハードウエアの破損という２次的障害が引き起こされる可能性がある。しかし、電源電圧の異常に対して、電源電圧のみの異常に留め、それに付随する電源負荷側のハードウェア上の損傷を最小限に抑えることが要求される。
【０００８】
これは、次に列挙する２つの側面からの要求である。第１に、電源電圧の異常が発生した機能部の交換又は修理等の保守作業が円滑かつ迅速に行われるようにし、電子式装置としての非稼動時間を最小限に抑えるという信頼度向上の観点から挙げられる要求である。
【０００９】
第２に、電源電圧の異常が発生した機能部とのインタフェースを有する他の機能部への影響を避けるためである。或る機能部の障害が他の機能部へ与える影響は、電子部品レベルでのストレスとなり、結果として電子式装置としての製品寿命を縮め、信頼性低下を招く。これを防ぐことから挙げられる要求である。
【００１０】
ここでその解決策として、電源電圧の異常が発生した機能部において、全ての電源電圧の供給を停止させる手段を挙げることができる。しかし、ヒューズ等を用い、電源電圧の異常時にヒューズを溶断させて、物理的に電源電圧の給電線を断線状態にし、電源電圧の供給を停止する手段を用いた場合、単一電源電圧用ヒューズの溶断発生により、全電源電圧の供給を停止させるために、該溶断が発生した機能部内の全電源電圧のヒューズを切断させる等のための余剰な機能追加が必要となり、コスト高となる。
【００１１】
また、ヒューズ自体が溶断するまでに僅かではあるが幾らかの時間を要し、その間に負荷側の機能部にハードウェア上の損傷が生じてしまう恐れがある。また、当該機能部の給電線の断線発生部分に対して、ハードウエア上の修繕を行わなければならない、等の理由から望ましいフェイルセイフ制御であるとはいえない。
【００１２】
本発明は、或る機能部の電源電圧の異常発生時に、該機能部におけるハードウエア上の損傷を最小限に留め、また、電子式装置内の他の機能部に対して、該電源電圧の異常発生によるハードウエアの損傷をもたらさないフェイルセーフ制御方式を提供することを目的とする。
【００１３】
【課題を解決するための手段】
本発明の電源電圧異常時のフェイルセーフ制御方式は、電源生成部から複数種類の電源電圧を複数の機能部へ供給する集中給電方式の電子式装置において、前記電源生成部は、それぞれ異なる電源電圧を生成し、前記複数の機能部へそれぞれ各機能部毎の別系統の配線により給電する複数の電圧生成部を備え、前記各機能部は、給電される各電源電圧を監視し、該電源電圧の異常を検出すると、該異常状態を通知する信号を前記電源生成部に送出する手段を備え、前記電源生成部は、前記機能部から、電源電圧の異常状態を通知する信号を受信したときに、該異常状態を通知する信号を送出した機能部のみに対して、前記各電圧生成部からの電源電圧の供給を停止させる手段を備えたものである。
【００１４】
【発明の実施の形態】
図１に本発明によるフェイルセーフ制御方式の電子式装置の構成を示す。同図は集中給電方式により、電源生成部２から各機能部１（＃１〜＃Ｎ）へ複数の電源電圧（Ｖ１〜Ｖｉ）を供給する電子式装置を示している。同図に示すように、各機能部１（＃１〜＃Ｎ）へ複数の電源電圧（Ｖ１〜Ｖｉ）をそれぞれ別系統の配線により供給する。これは、或る一つの機能部１（＃ｋ）（１≦ｋ≦Ｎ）において、電源電圧の異常が発生したとき、該機能部１（＃ｋ）に対してのみ、全ての電源電圧の供給を停止する機構を実現させるためである。
【００１５】
各機能部１（＃１〜＃Ｎ）には、給電される電源電圧を監視する電圧監視部１１をそれぞれ備える。各機能部１（＃１〜＃Ｎ）は、その電圧監視部１１により、自身への電源電圧の状態を常時監視し、電源電圧の異常を検出すると、該異常状態を通知する信号を電源生成部２へ送出する。
【００１６】
電源生成部２は、状態監視部２１と複数の電源電圧を生成する電圧生成部２２（Ｖ１〜Ｖｉ）とを備える。状態監視部２１は、機能部１（＃ｋ）からの電源電圧の異常状態を通知する信号を受信すると、各電圧生成部２２（Ｖ１〜Ｖｉ）に対して、直ちに該機能部１（＃ｋ）への給電を停止するよう制御信号を送出し、各電圧生成部２２（Ｖ１〜Ｖｉ）は、該制御信号に従って、該各機能部１（＃ｋ）への系統の全ての配線の給電を停止する。
【００１７】
この構成により、或る機能部１（＃ｋ）において、電源電圧の異常が発生した場合に、他の機能部１（＃ｊ）（１≦ｊ≦Ｎ，ｊ≠ｋ）へ影響を及ぼすことなく、電源電圧の異常が発生した該機能部１（＃ｋ）自体の機能障害のみに留め、電子式装置のハードウエア異常を最小限に抑えることができる。
【００１８】
本発明によるフェイルセーフ制御の具体例を図２を参照して説明する。図２は、図１と同様の集中給電方式による電子式装置を示し、電源生成部２は、各機能部１（＃１〜＃Ｎ）へ供給する電源電圧を生成する複数の電圧生成部２２（Ｖ１〜Ｖｉ）を備え、各電圧生成部２２（Ｖ１〜Ｖｉ）で生成された電源電圧は、各機能部１（＃１〜＃Ｎ）へそれぞれ別系統の配線で供給する。
【００１９】
また、各機能部１（＃１〜＃Ｎ）は、電源生成部２から供給される電源電圧の状態を監視する電圧監視部１１を有し、電圧監視部１１は電源電圧の状態を、常時、監視する。いま、機能部１（＃Ｎ）において、電源電圧ＶｉＮに異常が発生したとする（図２(1) ）。
【００２０】
機能部１（＃Ｎ）に設けられた電圧監視部１１は、その電源電圧ＶｉＮの異常を検出し、その異常状態を示すアラーム信号を直ちに電源生成部２へ通知する（図５(2) ）。電源生成部２に設けられた状態監視部２１は、該機能部１（＃Ｎ）からのアラーム信号の通知を受け、直ちに各電圧生成部２２（Ｖ１〜Ｖｉ）に、機能部１（＃Ｎ）への電源電圧供給を停止するよう、制御信号を送出する（図５(3) ）。
【００２１】
電源電圧供給を停止させる制御信号を受け取った各電圧生成部２２（Ｖ１〜Ｖｉ）は、直ちに該機能部１（＃Ｎ）の系統の全ての電源電圧の供給を停止する（図５(4) ）。このように、機能部１（＃Ｎ）において、電源電圧の異常が発生した場合、該機能部１（＃Ｎ）に対してのみ、全ての電源電圧の供給を直ちに停止することにより、他機能部へ影響を及ぼすことなく、該機能部１（＃Ｎ）自体のハードウエア異常を最小限に抑えることができる。
【００２２】
【発明の効果】
以上説明したように、本発明によれば、各機能部で電源電圧を監視し、該電源電圧の異常を検出すると、該異常状態を通知する信号を電源生成部に送出し、電源生成部は、電源電圧の異常状態を通知する信号を受信したときに、該異常状態を通知する信号を送出した機能部のみに対して、各電圧生成部からの電源電圧の供給を停止させることにより、電源電圧の異常を検出した機能部自体のハードウエアの損傷を最小限に抑えると共に、他の機能部に対する該損傷によるハードウエアの損傷の波及を防ぐことができる。
【図面の簡単な説明】
【図１】本発明によるフェイルセーフ制御方式の電子式装置の構成を示す図である。
【図２】本発明によるフェイルセーフ制御の具体例を示す図である。
【図３】従来の集中給電方式の電子式装置を示す図である。
【符号の説明】
１（＃１〜＃Ｎ） 機能部
１１ 電圧監視部
２ 電源生成部
２１ 状態監視部
２２（Ｖ１〜Ｖｉ） 電圧生成部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fail-safe control method when a power supply voltage is abnormal. 2. Description of the Related Art In recent years, there are many types of hardware mounted on electronic devices that use a plurality of different power supply voltages. The present invention relates to a fail-safe control method for a power supply voltage abnormality in an electronic device including a plurality of functional units using such hardware.
[0002]
[Prior art]
FIG. 3 shows a conventional centralized power supply type electronic device. As shown in the figure, the centralized power supply type electronic device performs centralized power supply from one power supply unit 3 to each of the functional units 1 (# 1 to #N) using a plurality of different power supply voltages. Each of the functional units 1 (# 1 to #N) includes a voltage monitoring unit 11 that monitors a voltage supplied.
[0003]
In such an electronic device, when a certain function unit 1 (#k) (1 ≦ k ≦ N) detects that at least one of the power supply voltages to itself is abnormal by the voltage monitoring unit 11, The abnormal state is notified to the upper-level device control unit 4 and a disconnection request is made.
[0004]
Upon receiving the notification of the voltage abnormality from the function unit 1 (#k), the higher-level device control unit 4 stops the function of the function unit 1 (#k) and functionally stops the function unit 1 (#k). (#K) is separated. This prevents the entire electronic apparatus from operating abnormally or malfunctioning.
[0005]
In addition, as a prior art for a power supply abnormality, there is a “power supply abnormality detection method” described in Patent Document 1 below. The "power supply abnormality detection method" includes a fuse blowout detection unit, an internal power supply voltage abnormality detection unit, and the like, so that it is possible to determine whether a power supply unit has failed, a fuse has been disconnected, or a connector has a poor connection.
[Patent Document 1]
Japanese Patent No. 2647663 gazette
[Problems to be solved by the invention]
As in the prior art shown in FIG. 3, when a notification of a voltage abnormality is received from the function unit 1 (#k), the function unit 1 (#k) is functionally disconnected in a fail-safe control method. When 1 (#k) is a hardware configuration driven by a plurality of power supply voltages, the power supply voltage in another normal state continues to be supplied. Therefore, the power supply voltage is normally supplied to some hardware circuits, and The abnormal power supply voltage continues to be supplied to some hardware circuits.
[0007]
As a result, in the worst case, the hardware of the function unit 1 (#k) and the peripheral hardware associated therewith may be damaged. In other words, there is a possibility that not only the abnormality of the power supply voltage but also a secondary failure such as damage of the hardware on the load side may be caused. However, it is required that the abnormality of the power supply voltage be limited to the abnormality of only the power supply voltage and the accompanying damage on the hardware of the power supply load be minimized.
[0008]
This is a requirement from the following two aspects. First, maintenance work such as replacement or repair of a functional unit in which a power supply voltage abnormality has occurred can be performed smoothly and promptly, and the non-operating time as an electronic device can be minimized to improve reliability. It is a request mentioned from.
[0009]
Second, it is to avoid affecting other functional units having an interface with the functional unit in which the power supply voltage abnormality has occurred. The effect of a failure of a certain functional unit on another functional unit causes stress at the electronic component level, resulting in a shortened product life of the electronic device and a reduction in reliability. This is a requirement to prevent this.
[0010]
Here, as a solution, a means for stopping the supply of all power supply voltages in the functional unit in which the power supply voltage abnormality has occurred can be cited. However, if a fuse is used and the fuse is blown when the power supply voltage is abnormal, the power supply line of the power supply voltage is physically disconnected and the power supply voltage supply is stopped. In order to stop the supply of the entire power supply voltage due to the occurrence of the fusing, it is necessary to add an extra function for cutting off the fuses of all the power supply voltages in the functional part in which the fusing has occurred, resulting in an increase in cost.
[0011]
In addition, it takes a little time for the fuse itself to melt, and during that time, there is a possibility that the functional part on the load side may be damaged in hardware. Further, fail-safe control cannot be said to be desirable because, for example, repair of hardware must be performed on a broken portion of the power supply line of the functional unit.
[0012]
The present invention minimizes hardware damage to a functional unit when an abnormality occurs in the power supply voltage of a certain functional unit, and also reduces the power supply voltage of another functional unit in the electronic device. An object of the present invention is to provide a fail-safe control method that does not cause hardware damage due to occurrence of an abnormality.
[0013]
[Means for Solving the Problems]
The fail-safe control method when the power supply voltage is abnormal according to the present invention is a centralized power supply type electronic device that supplies a plurality of types of power supply voltages to a plurality of functional units from a power supply generation unit. And a plurality of voltage generating units for supplying power to the plurality of functional units by wiring of different systems for each functional unit, wherein each of the functional units monitors each power supply voltage supplied thereto, and When detecting an abnormality of the power supply unit, the power generation unit includes a unit that sends a signal notifying the abnormal state to the power generation unit. Means for stopping the supply of the power supply voltage from each of the voltage generators only to the functional units that have transmitted the signal for notifying the abnormal state.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows the configuration of a fail-safe control type electronic device according to the present invention. FIG. 1 shows an electronic device that supplies a plurality of power supply voltages (V1 to Vi) from the power supply generation unit 2 to each of the functional units 1 (# 1 to #N) by a centralized power supply system. As shown in the figure, a plurality of power supply voltages (V1 to Vi) are supplied to each of the functional units 1 (# 1 to #N) through wirings of different systems. This is because when an abnormality of the power supply voltage occurs in one of the functional units 1 (#k) (1 ≦ k ≦ N), only the functional unit 1 (#k) receives all power supply voltages. This is to realize a mechanism for stopping supply.
[0015]
Each of the functional units 1 (# 1 to #N) includes a voltage monitoring unit 11 that monitors a power supply voltage to be supplied. Each of the functional units 1 (# 1 to #N) constantly monitors the state of the power supply voltage to itself by the voltage monitoring unit 11, and when detecting an abnormality of the power supply voltage, generates a signal for notifying the abnormal state of the power supply. Send to section 2.
[0016]
The power generation unit 2 includes a state monitoring unit 21 and voltage generation units 22 (V1 to Vi) that generate a plurality of power supply voltages. Upon receiving the signal notifying the abnormal state of the power supply voltage from the function unit 1 (#k), the state monitoring unit 21 immediately sends the signal to the voltage generation units 22 (V1 to Vi) to the function unit 1 (#k). ) Is transmitted, and the voltage generators 22 (V1 to Vi) supply power to all the wires of the system to the respective functional units 1 (#k) according to the control signals. Stop.
[0017]
With this configuration, when an abnormality in the power supply voltage occurs in a certain functional unit 1 (#k), it affects other functional units 1 (#j) (1 ≦ j ≦ N, j ≠ k). In addition, it is possible to limit only the functional failure of the functional unit 1 (#k) itself in which the power supply voltage abnormality has occurred, and to minimize the hardware abnormality of the electronic device.
[0018]
A specific example of the fail-safe control according to the present invention will be described with reference to FIG. FIG. 2 shows an electronic device using a centralized power supply system similar to that of FIG. 1, and a power generation unit 2 includes a plurality of voltage generation units 22 that generate power supply voltages to be supplied to each of the functional units 1 (# 1 to #N). (V1 to Vi), and the power supply voltage generated by each of the voltage generation units 22 (V1 to Vi) is supplied to each of the function units 1 (# 1 to #N) through a different system wiring.
[0019]
Each of the functional units 1 (# 1 to #N) has a voltage monitoring unit 11 that monitors the state of the power supply voltage supplied from the power generation unit 2, and the voltage monitoring unit 11 constantly monitors the state of the power supply voltage. ,Monitor. Now, it is assumed that an abnormality has occurred in the power supply voltage ViN in the functional unit 1 (#N) (FIG. 2 (1)).
[0020]
The voltage monitoring unit 11 provided in the function unit 1 (#N) detects the abnormality of the power supply voltage ViN and immediately notifies the power generation unit 2 of an alarm signal indicating the abnormal state (FIG. 5 (2)). . The state monitoring unit 21 provided in the power generation unit 2 receives the notification of the alarm signal from the function unit 1 (#N), and immediately sends the function unit 1 (#N) to each of the voltage generation units 22 (V1 to Vi). A control signal is sent so as to stop the supply of the power supply voltage to ()) (FIG. 5 (3)).
[0021]
Upon receiving the control signal for stopping the supply of the power supply voltage, each of the voltage generation units 22 (V1 to Vi) immediately stops supply of all the power supply voltages of the system of the functional unit 1 (#N) (FIG. 5 (4)). ). As described above, when an abnormality in the power supply voltage occurs in the functional unit 1 (#N), the supply of all the power supply voltages to only the functional unit 1 (#N) is immediately stopped, so that other functions can be performed. The hardware abnormality of the function unit 1 (#N) itself can be minimized without affecting the unit.
[0022]
【The invention's effect】
As described above, according to the present invention, each functional unit monitors the power supply voltage, and when detecting an abnormality in the power supply voltage, sends a signal notifying the abnormal state to the power supply generation unit, and the power generation unit When a signal notifying the abnormal state of the power supply voltage is received, the supply of the power supply voltage from each voltage generation unit to only the functional unit that has transmitted the signal notifying the abnormal state is stopped, thereby making the power supply It is possible to minimize the damage to the hardware of the functional unit that has detected the abnormal voltage, and to prevent the damage to the hardware from spreading to other functional units.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an electronic device of a fail-safe control system according to the present invention.
FIG. 2 is a diagram showing a specific example of fail-safe control according to the present invention.
FIG. 3 is a diagram showing a conventional centralized power supply type electronic device.
[Explanation of symbols]
1 (# 1 to #N) Function unit 11 Voltage monitoring unit 2 Power generation unit 21 State monitoring unit 22 (V1 to Vi) Voltage generation unit

Claims (1)

電源生成部から複数種類の電源電圧を複数の機能部へ供給する集中給電方式の電子式装置において、
前記電源生成部は、それぞれ異なる電源電圧を生成し、前記複数の機能部へそれぞれ各機能部毎の別系統の配線により給電する複数の電圧生成部を備え、
前記各機能部は、給電される各電源電圧を監視し、該電源電圧の異常を検出すると、該異常状態を通知する信号を前記電源生成部に送出する手段を備え、
前記電源生成部は、前記機能部から、電源電圧の異常状態を通知する信号を受信したときに、該異常状態を通知する信号を送出した機能部のみに対して、前記各電圧生成部からの電源電圧の供給を停止させる手段を備えたことを特徴とする電源電圧異常時のフェイルセーフ制御方式。In a centralized power supply type electronic device that supplies a plurality of types of power supply voltages to a plurality of functional units from a power supply generation unit,
The power generation unit includes a plurality of voltage generation units that generate different power supply voltages, respectively, and supply power to the plurality of function units via a different system wiring for each function unit,
Each of the functional units includes a unit that monitors each power supply voltage to be supplied and, when detecting an abnormality in the power supply voltage, sends a signal notifying the abnormal state to the power generation unit.
The power generation unit, when receiving a signal notifying the abnormal state of the power supply voltage from the functional unit, only for the functional unit that has transmitted the signal notifying the abnormal state, from each of the voltage generating unit A fail-safe control method when the power supply voltage is abnormal, comprising means for stopping supply of the power supply voltage.
JP2002380028A 2002-12-27 2002-12-27 Fail-safe control system at the time of abnormal power supply voltage Withdrawn JP2004215352A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008054434A (en) * 2006-08-25 2008-03-06 Nec Computertechno Ltd Power supply control unit, power supply system and method for controlling power supply
JP2008071201A (en) * 2006-09-14 2008-03-27 Fujitsu Ltd Power source failure monitoring method and device
JP2011192174A (en) * 2010-03-16 2011-09-29 Ricoh Co Ltd Electronic device, image forming apparatus, and power supply method of electronic device
DE102008027591B4 (en) * 2007-06-12 2017-04-13 Mitsubishi Electric Corp. Vehicle electronic control

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008054434A (en) * 2006-08-25 2008-03-06 Nec Computertechno Ltd Power supply control unit, power supply system and method for controlling power supply
JP2008071201A (en) * 2006-09-14 2008-03-27 Fujitsu Ltd Power source failure monitoring method and device
DE102008027591B4 (en) * 2007-06-12 2017-04-13 Mitsubishi Electric Corp. Vehicle electronic control
JP2011192174A (en) * 2010-03-16 2011-09-29 Ricoh Co Ltd Electronic device, image forming apparatus, and power supply method of electronic device

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