JPS6027053B2 - Storage device protection circuit - Google Patents
Storage device protection circuitInfo
- Publication number
- JPS6027053B2 JPS6027053B2 JP52067156A JP6715677A JPS6027053B2 JP S6027053 B2 JPS6027053 B2 JP S6027053B2 JP 52067156 A JP52067156 A JP 52067156A JP 6715677 A JP6715677 A JP 6715677A JP S6027053 B2 JPS6027053 B2 JP S6027053B2
- Authority
- JP
- Japan
- Prior art keywords
- power
- storage device
- circuit
- protection circuit
- optical coupling
- 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.)
- Expired
Links
Landscapes
- Techniques For Improving Reliability Of Storages (AREA)
Description
【発明の詳細な説明】
本発明は、電源投入時あるいは電源断時に記憶内容が破
壊されないようにする記憶機器保護回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a storage device protection circuit that prevents storage contents from being destroyed when power is turned on or turned off.
従来の一例として、フロッピー・ディスク・ドライブに
ついていえば、電源投入時（又は断時）にディスクをセ
ットしたままであると書き込みコイル又は読み出しコイ
ルに過渡電流が流れるためディスクの記憶内容が破壊さ
れるという欠点があつた。As a conventional example, in the case of a floppy disk drive, if the disk is left set when the power is turned on (or turned off), a transient current flows through the write coil or read coil, destroying the stored contents of the disk. There was a drawback.
本発明に目的は、電源投入または断を検知し、記憶内容
が破壊されないようにする記憶機器保護回路を提供する
ことである。An object of the present invention is to provide a storage device protection circuit that detects power-on or power-off and prevents storage contents from being destroyed.
以下、実施例に従い、図面を参照して本発明を詳細に説
明する。Hereinafter, the present invention will be described in detail according to examples and with reference to the drawings.
入力端子１に加えられた交流電圧を整流回路２で整流し
て得られる電圧を、電流制限抵抗３、光結合素子６の発
光ダイオード５および定電圧ダイオード４を直列接続し
た回路に印加する。A voltage obtained by rectifying an AC voltage applied to an input terminal 1 by a rectifier circuit 2 is applied to a circuit in which a current limiting resistor 3, a light emitting diode 5 of an optical coupling element 6, and a constant voltage diode 4 are connected in series.
光結合素子６の電源端子７、端子１７には５ボルトを加
える。フロッピー・デイスク・ドライブ・ヘッド部１６
の端子２２にはヘッドコイル２３，２４の駆動用蟹源電
圧を加える。電源電圧が正常であれば、端子１７には５
ボルトが加わり、スイッチ用トランジスタ１０は導適状
態となる。同時に、発光ダイオード５は発光し、光結合
素子６は導適状態となり、スイッチ用トランジスタ１５
の入力１９は５ボルトになる。そして、スイッチ用トラ
ンジスタ１５は導適状態となる。２つのスイッチ用トラ
ンジスタ１０および１５が導適状態となり、書き込み、
読み出しコイル２３および２４に電流を流すことができ
る。5 volts are applied to the power supply terminal 7 and terminal 17 of the optical coupling element 6. Floppy disk drive head section 16
A source voltage for driving the head coils 23 and 24 is applied to the terminal 22 of the head coils 23 and 24. If the power supply voltage is normal, there will be 5 at terminal 17.
Volt is applied, and the switching transistor 10 becomes conductive. At the same time, the light emitting diode 5 emits light, the optical coupling element 6 becomes conductive, and the switching transistor 15
Input 19 of will be 5 volts. Then, the switching transistor 15 becomes conductive. The two switching transistors 10 and 15 become conductive, and write,
Current can be passed through the readout coils 23 and 24.
抵抗２０および２１は電流制限用と動作点決定用である
。電源投入時には、コンデンサ１２に端子１７より充電
が開始され、コンデンサ１２の充轟々圧がスイッチ用ト
ランジスタ１０の動作点に達するまでの時間はスイッチ
用トランジスタ１０はカットオフ状態となり、ヘッドコ
イル２３および２４には電流が流れない。したがって電
源投入時の過渡電流は流れない。次に電源断のときは整
流出力電圧が下がり、定電圧ダイオード４の設定値以下
になると、光結合素子６は遮断状態となり、したがって
スイッチ用トランジスタ１５は遮断状態となる。すなわ
ち電源断のとき、フロッピー・ディスク・ドライブ用電
源の出力電圧が低下をはじめて過渡状態になるまえにヘ
ッドコイルの電流を遮断し、ディスクの内容の保護を行
う。本発明によれば、外部記憶機器の電源投入断時にお
ける記憶内容保護のための操作が省略でき取扱いが簡単
になる。Resistors 20 and 21 are for current limiting and for determining the operating point. When the power is turned on, charging of the capacitor 12 is started from the terminal 17, and the switching transistor 10 is in a cut-off state during the time it takes for the charging and pulsating pressure of the capacitor 12 to reach the operating point of the switching transistor 10, and the head coils 23 and 24 No current flows through. Therefore, no transient current flows when the power is turned on. Next, when the power is cut off, the rectified output voltage decreases, and when it becomes less than the set value of the voltage regulator diode 4, the optical coupling element 6 becomes cut off, and therefore the switching transistor 15 becomes cut off. That is, when the power is turned off, the current to the head coil is cut off before the output voltage of the floppy disk drive power supply begins to drop and enters a transient state, thereby protecting the contents of the disk. According to the present invention, operations for protecting stored contents when turning on/off the power of an external storage device can be omitted, making handling easier.
また、停電等の事故に対し、記憶内容が保護され、無停
電電源を必要とせず、経済効果が大きい。In addition, the memory contents are protected against accidents such as power outages, and an uninterruptible power supply is not required, resulting in a large economic effect.
さらに、本発明の回路はトランスを用いる必要がないの
で、安価で小型にできる利点がある。Furthermore, since the circuit of the present invention does not require the use of a transformer, it has the advantage of being inexpensive and compact.
図は本発明の一実施例の回路結合線図である。
１・・・・・・交流入力端子、２・・・・・・整流回路
、３・・・・・・電流制限抵抗、４…・・・定電圧ダイ
オード、５・・・・・・発光ダイオード、６・・・・・
・光結合素子、７，１２・・・・・・電源端子、８・・
・・・・平滑用コンデンサ、９・・・・・・平滑用抵抗
、１０・・・・・・スイッチ用トランジスタ、１１・・
・・・・充電用抵抗、１２・・・・・・充電用コンデン
サ、１３……トラジスタベース、１４……トラジス夕べ
ース、１５……スイッチ用トランジスタ２、１６……フ
ロッピーディスクヘッド部、１８，１９……スイッチ用
トランジスタ入力、２０，２１…・・・電流制限抵抗、
２２・・・・・・フロッピーディスクヘッドコイル駆動
用電源端子、２３，２４・・・・・・ヘッドコイル。The figure is a circuit connection diagram of one embodiment of the present invention. 1... AC input terminal, 2... Rectifier circuit, 3... Current limiting resistor, 4... Constant voltage diode, 5... Light emitting diode , 6...
・Optical coupling element, 7, 12...Power terminal, 8...
... Smoothing capacitor, 9 ... Smoothing resistor, 10 ... Switch transistor, 11 ...
...Charging resistor, 12...Charging capacitor, 13...Transistor base, 14...Transistor base, 15...Switch transistor 2, 16...Floppy disk head section, 18, 19... Switch transistor input, 20, 21... Current limiting resistor,
22...Floppy disk head coil drive power supply terminal, 23, 24...Head coil.
Claims (1)
子の発光ダイオードを駆動し、該光結合素子の発光素子
出力を検知信号とする電源断検知回路と、該電源断検知
回路より大きな立上り時定数を有し前記入力交流電源を
供給源とする電源に接続された充電回路とを備え、前記
検知信号と前記充電回路の出力との論理積により、電源
投入時又は電源断時に記憶機器の書き込み又は読み出し
電流通路の開閉を制御することを特徴とする記憶機器保
護回路。1. A power-off detection circuit that drives a light-emitting diode of an optical coupling element with the output of a rectifier circuit that rectifies input AC power, and uses the output of the light-emitting element of the optical coupling element as a detection signal, and a power-off detection circuit that detects a rise larger than that of the power-off detection circuit. a charging circuit that has a constant and is connected to a power source that uses the input AC power as a supply source, and writes data to the storage device when the power is turned on or off by logical product of the detection signal and the output of the charging circuit. Or a storage device protection circuit characterized by controlling opening/closing of a read current path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52067156A JPS6027053B2 (en) | 1977-06-06 | 1977-06-06 | Storage device protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52067156A JPS6027053B2 (en) | 1977-06-06 | 1977-06-06 | Storage device protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54936A JPS54936A (en) | 1979-01-06 |
| JPS6027053B2 true JPS6027053B2 (en) | 1985-06-27 |
Family
ID=13336746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52067156A Expired JPS6027053B2 (en) | 1977-06-06 | 1977-06-06 | Storage device protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6027053B2 (en) |
-
1977
- 1977-06-06 JP JP52067156A patent/JPS6027053B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54936A (en) | 1979-01-06 |
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