JPH0363714A - Dc power feeding system to ram card - Google Patents

Dc power feeding system to ram card

Info

Publication number
JPH0363714A
JPH0363714A JP1200619A JP20061989A JPH0363714A JP H0363714 A JPH0363714 A JP H0363714A JP 1200619 A JP1200619 A JP 1200619A JP 20061989 A JP20061989 A JP 20061989A JP H0363714 A JPH0363714 A JP H0363714A
Authority
JP
Japan
Prior art keywords
ram card
battery
power
ram
card
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
JP1200619A
Other languages
Japanese (ja)
Inventor
Noriyuki Takagi
高木　規之
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP1200619A priority Critical patent/JPH0363714A/en
Publication of JPH0363714A publication Critical patent/JPH0363714A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To hold the data of a RAM card by providing a voltage drop detecting means for a battery in the RAM card, and a DC power feeding means for feeding a backup power source of a system side to the RAM card when a voltage of the battery in the RAM card drops. CONSTITUTION:The subject system is provided with a voltage drop detecting means 5 for always monitoring a voltage of a battery check terminal 3 and detecting a voltage drop of a battery 7, and a DC power feeding means 6 for feeding DC power to a power source terminal 2 of a RAM card from a data holding power source 8 in a system, when the voltage drop detecting circuit 5 operates at the time of turning off of a power source in the system. In such a way, it is prevented that the RAM card is left as it is for many hours in a state that the remaining quantity of a battery contained in the RAM card is small and the system power source is turned off, and the data in the RAM card can be held.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はＲＡＭカードへの直流電力給電方式に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a method for supplying DC power to a RAM card.

〔従来の技術〕[Conventional technology]

従来のＲＡＭカードへの直流電力給電方式は、マイクロ
コンピュータシステムの電源がオンのときにはシステム
側からＲＡＭカードの電源端子に供給され、システムの
電源がオフのときには、又はＲＡＭカードがシステムに
接続されていない場合には、ＲＡＭカード内蔵の電池に
よって電力を供給し、データ保持を行う方式になってい
た。また、ＲＡＭカードの内蔵電池の端子電圧がシステ
ムとの接続端子の一部であるバッテリチェック端子から
出力され、システム本体側から内蔵電池の電圧を監視で
きる方式も有り、システム側からバッテリチェック端子
で内蔵電池の電圧を監視し、電圧低下時に警報を出して
いた。In the conventional method of supplying DC power to a RAM card, when the microcomputer system is powered on, the power is supplied from the system side to the power terminal of the RAM card, and when the system is powered off or when the RAM card is not connected to the system, the DC power is supplied from the system side to the power terminal of the RAM card. If not, the system used a battery built into the RAM card to supply power and retain data. There is also a method in which the terminal voltage of the built-in battery of the RAM card is output from the battery check terminal, which is part of the connection terminals with the system, and the voltage of the built-in battery can be monitored from the system side. It monitored the voltage of the built-in battery and issued an alarm when the voltage dropped.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のＲＡＭカードへの直流電力給電方式は、
システム側の電源がオンのときにはシステム側からＲＡ
Ｍカードへ電力を供給し、システム側の電源がオフのと
きには、ＲＡＭカード内蔵の電池によって電力を供給し
、システム側から内蔵電池の電圧低下時に警報を出すよ
うになっているが、システムの電源オフ時にＲＡＭカー
ドの内蔵電池の電圧が低下した場合に、ＲＡＭカード内
部のデータ保護をする機能を有していないので、ＲＡＭ
カード内蔵電池の残量が少ない状態でシステム電源オフ
のまま長時間放置しておくと、ＲＡＭカード内のデータ
が保持されないことがあるという欠点がある。The conventional DC power supply method to the RAM card described above is as follows:
RA from the system side when the system side power is on.
Power is supplied to the M card, and when the system power is off, power is supplied by the battery built into the RAM card, and the system issues an alarm when the built-in battery voltage drops, but the system power supply If the voltage of the built-in battery of the RAM card drops when the RAM card is turned off, it does not have a function to protect the data inside the card.
If the system power is left off for a long time when the built-in battery of the card is low, the data in the RAM card may not be retained.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のＲＡＭカードへの直流電力給電方式は、カード
内部にＲＡＭとこのＲＡＭ内のデータ保持用の電池とを
内蔵し、前記電池との端子電圧を出力するバッテリチェ
ック端子を有するＲＡＭカードへ直流電力を供電するＲ
ＡＭカードへの直流電力給電方式において、前記バッテ
リチェック端子の電圧を常時監視して前記電池の電圧低
下を検出する電圧低下検出手段と、システムが電源オフ
時に前記電圧低下検出回路が動作した場合に前記ＲＡＭ
カードの電源端子に前記システム内のデータ保持用電源
から直流電力を給電する直流電力給電手段とを有してい
る。The DC power supply method to the RAM card of the present invention includes a built-in RAM and a battery for retaining data in the RAM, and direct current is supplied to the RAM card that has a battery check terminal that outputs the terminal voltage with the battery. R that supplies power
In the DC power supply method to the AM card, there is provided a voltage drop detection means for constantly monitoring the voltage of the battery check terminal to detect a voltage drop in the battery, and a voltage drop detection circuit that operates when the system is powered off. The RAM
and DC power supply means for supplying DC power from the data retention power supply in the system to the power supply terminal of the card.

〔実施例〕〔Example〕

次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

ボ１図は本発明の一実施例を示すブロック図である。Figure 1 is a block diagram showing one embodiment of the present invention.

第１図において、本実施例はＲＡＭカード（図示省略）
に電力を供給するためのＲＡＭカード電源端子２．ＲＡ
Ｍカード内蔵の電池（図示省略）の端子電圧を監視する
ためのバッテリチェック端子３．システムバス４の接続
端子等を有するＲＡＭカード接続コネクタ１と、バッテ
リチェック端子３からＲＡＭカード内の電池の出力電圧
を監視する電圧低下検出回路５と、システム全体のバッ
クアップ用のバックアップ電池７と、システム全体用の
システム主電源８と、システムデータ保持用ＲＡＭｌ０
と、バックアップ電池７またはシステム主電源８を出力
させるＯＲ回路９と、システム主電源８がオフ時に電圧
低下検出回路５の検出信号によってＲＡＭカード接続コ
ネクタ１のＲＡＭカード電源端子２ヘパツクアツプ電池
７からの電力を供給できるように切替える切替え回路６
とを有して構成されている。In FIG. 1, this embodiment is a RAM card (not shown).
RAM card power terminal for supplying power to 2. R.A.
Battery check terminal for monitoring the terminal voltage of the battery (not shown) built into the M card 3. A RAM card connection connector 1 having a connection terminal for a system bus 4, etc., a voltage drop detection circuit 5 for monitoring the output voltage of a battery in the RAM card from a battery check terminal 3, and a backup battery 7 for backing up the entire system. System main power supply 8 for the entire system and RAM 10 for system data retention
and an OR circuit 9 that outputs the backup battery 7 or the system main power supply 8, and an OR circuit 9 that outputs the backup battery 7 or the system main power supply 8, and a detection signal from the voltage drop detection circuit 5 when the system main power supply 8 is off. Switching circuit 6 that switches so that power can be supplied
It is composed of:

次は、本実施例の動作について説明する。Next, the operation of this embodiment will be explained.

今、ＲＡＭカード接続コネクタ１にＲＡＭカードが接続
され、ＲＡＭカード内電池は充分な残量を有していると
すると、電圧低下検出回路５の出力は非活性状態であり
、従って、切替え回路６の内部のスイッチはシステム主
電源８をＲＡＭカード電源端子２に接続させている。Now, assuming that a RAM card is connected to the RAM card connection connector 1 and the battery in the RAM card has sufficient remaining power, the output of the voltage drop detection circuit 5 is in an inactive state, and therefore the switching circuit 6 A switch inside connects the system main power supply 8 to the RAM card power supply terminal 2.

ＲＡＭカードへの給電はＲＡＭカード電源端子２を介し
てシステム電源８のオン／オフと同期して行われ、シス
テム電源８のオフの時はＲＡＭカード内の電池によりＲ
ＡＭカード内のデータが保持される。ＲＡＭカード内電
池の電圧が低下すると電圧低下検出回路５がこれを検出
して検出信号を出力する。この検出信号により切替え回
路６内のスイッチはシステム主電源８からシステムのバ
ックアップ電池７に切替わる。Power is supplied to the RAM card via the RAM card power supply terminal 2 in synchronization with the on/off of the system power supply 8, and when the system power supply 8 is turned off, R is supplied by the battery inside the RAM card.
The data in the AM card is retained. When the voltage of the battery in the RAM card drops, the voltage drop detection circuit 5 detects this and outputs a detection signal. This detection signal causes a switch in the switching circuit 6 to switch from the system main power source 8 to the system backup battery 7.

バックアップ電池７はシステム電源８のオン／オフにか
かわらず常にオン状態であるから、　ＲＡＭカード内の
データはシステム内のバックアップ電池７により保持さ
れる。Since the backup battery 7 is always on regardless of whether the system power supply 8 is on or off, the data in the RAM card is retained by the backup battery 7 in the system.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、ＲＡＭカードのバッテリ
チェックの端子の電圧の監視によるＲＡＭカード内の電
池の電圧低下検出手段と、ＲＡＭカード内の電池の電圧
が低下した際にシステム側のバックアップ電源をＲＡＭ
カードに給電する直流電力給電手段とを有することによ
り、システムの電源がオフの状態でＲＡＭカード内蔵の
電池の残量がなくなった場合にも、システム側のバック
アップ電源からＲＡＭカードへ直流電力が給電され、Ｒ
ＡＭカードのデータを保持することができる効果がある
。As explained above, the present invention provides a means for detecting a voltage drop in the battery in a RAM card by monitoring the voltage of the battery check terminal of the RAM card, and a backup power source on the system side when the voltage of the battery in the RAM card drops. RAM
By having a DC power supply means for supplying power to the card, DC power is supplied from the system side backup power supply to the RAM card even if the battery built into the RAM card runs out of power while the system is powered off. and R
This has the effect of being able to hold data on the AM card.

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

第１図は本発明の一実施例を示すブロック図である。 １・・・・・・ＲＡＭカード接続コネクタ、２・・・・
・・ＲＡＭカード電源端子、３・・・・・・バッテリチ
ェック端子、４・・・・・・システムバス、５・・・・
・・電圧低下検出回路、６・・・・・・切替え回路、７
・・・・・・バックアップ電池、８・・・・・・システ
ム主電源、９・・・・・・ＯＲ回路、１０・・・・・・
システムデータ保持用ＲＡＭ。FIG. 1 is a block diagram showing one embodiment of the present invention. 1...RAM card connection connector, 2...
...RAM card power supply terminal, 3...Battery check terminal, 4...System bus, 5...
...Voltage drop detection circuit, 6...Switching circuit, 7
...Backup battery, 8...System main power supply, 9...OR circuit, 10...
RAM for holding system data.

Claims (1)

【特許請求の範囲】[Claims] カード内部にＲＡＭとこのＲＡＭ内のデータ保持用の電
池とを内蔵し、前記電池の端子電圧を出力するバッテリ
チェック端子を有するＲＡＭカードへ直流電力を供電す
るＲＡＭカードへの直流電力給電方式において、前記バ
ッテリチェック端子の電圧を常時監視して前記電池の電
圧低下を検出する電圧低下検出手段と、システムが電源
オフ時に前記電圧低下検出回路が動作した場合に前記Ｒ
ＡＭカードの電源端子に前記システム内のデータ保持用
電源から直流電力を給電する直流電力給電手段とを有す
ることを特徴とするＲＡＭカードへの直流電力給電方式In a DC power supply method to a RAM card that supplies DC power to a RAM card that has a built-in RAM and a battery for holding data in the RAM, and has a battery check terminal that outputs the terminal voltage of the battery, Voltage drop detection means constantly monitors the voltage of the battery check terminal to detect a voltage drop of the battery; and when the voltage drop detection circuit operates when the system is powered off, the R
A method for supplying DC power to a RAM card, comprising a DC power supply means for supplying DC power from a data retention power supply in the system to a power supply terminal of an AM card.
JP1200619A 1989-08-01 1989-08-01 Dc power feeding system to ram card Pending JPH0363714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1200619A JPH0363714A (en) 1989-08-01 1989-08-01 Dc power feeding system to ram card

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1200619A JPH0363714A (en) 1989-08-01 1989-08-01 Dc power feeding system to ram card

Publications (1)

Publication Number Publication Date
JPH0363714A true JPH0363714A (en) 1991-03-19

Family

ID=16427391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1200619A Pending JPH0363714A (en) 1989-08-01 1989-08-01 Dc power feeding system to ram card

Country Status (1)

Country Link
JP (1) JPH0363714A (en)

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