JPH02139649A - Backup circuit for sram memory card - Google Patents

Backup circuit for sram memory card

Info

Publication number
JPH02139649A
JPH02139649A JP63293330A JP29333088A JPH02139649A JP H02139649 A JPH02139649 A JP H02139649A JP 63293330 A JP63293330 A JP 63293330A JP 29333088 A JP29333088 A JP 29333088A JP H02139649 A JPH02139649 A JP H02139649A
Authority
JP
Japan
Prior art keywords
memory card
resistor
transistor
voltage
sram memory
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
JP63293330A
Other languages
Japanese (ja)
Inventor
Takashi Teramoto
寺本 敬
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.)
Toshiba Corp
Toshiba Kairo Buhin Engineering KK
Original Assignee
Toshiba Corp
Toshiba Kairo Buhin Engineering KK
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 Toshiba Corp, Toshiba Kairo Buhin Engineering KK filed Critical Toshiba Corp
Priority to JP63293330A priority Critical patent/JPH02139649A/en
Publication of JPH02139649A publication Critical patent/JPH02139649A/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
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

PURPOSE:To quickly perform switching between a power source and a battery by providing a Zener diode having a specific characteristic and a resistor having a specific resistance value. CONSTITUTION:A second resistor 10 and a second transistor TR 6 are provided, and this resistor 10 is connected in series to one end of a Zener diode 4 which has the other end connected to the connection path between a first TR 1, which is related to required voltage current application from a power source 3 to an SRAM memory card main body 2, and the power source 3, and the second TR 6 has the base connected to the second resistor 10 through a first resistor 5 and has the collector connected to the base of the first TR 1. The Zener diode 4 has 3.1 to 3.5V Zener voltage for 5mA current, and the second resistor 10 has 120 to 200OMEGA resistance value. Consequently, the first TR 1 is sensitively affected by the voltage reduction of the power source 3 and is easily and quickly turned off. Thus, the power source 3 is smoothly switched to a battery 8.

Description

【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明は、SRAMメモリカード用バックアップ回路に
係り、特に電源電圧が所定値より低下した場合、速やか
に電源をバッテリに切換うるように改良したSRAMメ
モリカード用バックアップ回路に関する。
[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a backup circuit for an SRAM memory card, and in particular, when the power supply voltage drops below a predetermined value, the power supply is quickly switched to a battery. This invention relates to a greatly improved backup circuit for SRAM memory cards.

(従来の技術) 周知の様に、IC素子をメモリ素子として内蔵するメモ
リカードは、種々の分野で広く利用されている。ところ
で、この種メモリカード、例えばSRAMメモリカード
において、所要の機能を常時、保持発揮させるためには
メモリ素子に、所定の電圧、電流を加えうるようにして
おく必要がある。第3図はこのような考慮に基づいたS
RAMメモリカード用のバックアップ回路図である。
(Prior Art) As is well known, memory cards incorporating IC elements as memory elements are widely used in various fields. By the way, in this type of memory card, for example, an SRAM memory card, in order to maintain and exhibit the required functions at all times, it is necessary to be able to apply a predetermined voltage and current to the memory element. Figure 3 shows S based on these considerations.
FIG. 3 is a backup circuit diagram for a RAM memory card.

図において1はSRAMメモリカード本体2と電源3と
の接続路に配設された第一のトランジスタ、4は前記第
一のトランジスタ1と電源3との間の接続路に一端が接
続するツェナダイオードである。
In the figure, 1 is a first transistor disposed in the connection path between the SRAM memory card body 2 and the power source 3, and 4 is a Zener diode whose one end is connected to the connection path between the first transistor 1 and the power source 3. It is.

しかして前記ツェナダイオード4は第一の抵抗体5を介
して第二のトランジスタ6のベース側に接続され、また
前記第二のトランジスタ6のコレクタ側は前記第一のト
ランジスタ1のベース側に接続している。更に、前記S
RAMメモリカード本体2と第一のトランジスタ1との
間の接続路にダイオード7を介してバッテリ8が接続さ
れている。
Thus, the Zener diode 4 is connected to the base side of the second transistor 6 via the first resistor 5, and the collector side of the second transistor 6 is connected to the base side of the first transistor 1. are doing. Furthermore, the above S
A battery 8 is connected to a connection path between the RAM memory card body 2 and the first transistor 1 via a diode 7.

なお、第3図において9a、 9bはいずれも抵抗体で
ある。しかして、上記回路においては、電源3の電圧が
所定値以上にあると、ツェナダイオード4及び第一の抵
抗体5を介して、所定の電圧乃至電流がベース側に加え
られる第二のトランジスタ6の動作によって、第一のト
ランジスタ1を介し、前記電源3からSRAMメモリカ
ード本体2に所要の電圧電流が印加され、SRAMメモ
リカード本体2は所要の駆動をなす。一方、電源3の電
圧が所定値以下になると、ツェナダイオード4の電流は
遮断されるため、第二のトランジスタ6も動作しなくな
り、第一のトランジスタ1は電源3からSRAMメモリ
カード本体2に所要の電圧電流を印加する機能を失う。
In addition, in FIG. 3, both 9a and 9b are resistors. In the above circuit, when the voltage of the power supply 3 is higher than a predetermined value, a predetermined voltage or current is applied to the base side of the second transistor 6 via the Zener diode 4 and the first resistor 5. By this operation, a required voltage and current is applied from the power supply 3 to the SRAM memory card body 2 via the first transistor 1, and the SRAM memory card body 2 is driven as required. On the other hand, when the voltage of the power supply 3 falls below a predetermined value, the current of the Zener diode 4 is cut off, so the second transistor 6 also stops operating, and the first transistor 1 is connected to the SRAM memory card body 2 from the power supply 3. loses the ability to apply voltage and current.

こうして、SRAMメモリカード本体2に所要の電圧電
流が印加されなくなると、つまりSRAMメモリカード
本体2に対する印加電圧が低下乃至無になると、バッテ
リ8からダオード7を介して所要の駆動電圧がSRAM
メモリカード本体2に印加され、所定の動作を続行しつ
るようになっている。
In this way, when the required voltage and current are no longer applied to the SRAM memory card body 2, that is, when the voltage applied to the SRAM memory card body 2 decreases or becomes absent, the required drive voltage is applied from the battery 8 to the SRAM memory card body 2 via the diode 7.
The voltage is applied to the memory card main body 2, and the predetermined operation continues.

(発明が解決しようとする課題) しかし、上記SRAMメモリカード用バックアップ回路
においては、実用上次のような不都合が認められる。即
ち上記回路について、S RAMメモリカード本体2に
印加される電圧乃至電流(mA)と電源3の電圧V D
D (V )との関係を調べたところ第4図に示すごと
く、前記SRAMメモリカード本体2の動作下限電圧V
  以下でも、in ある電圧範囲内では依然と電流が流れており、直ちにバ
ッテリ8から電圧電流印加がなされない。
(Problems to be Solved by the Invention) However, in the above-mentioned backup circuit for an SRAM memory card, the following practical disadvantages are recognized. That is, for the above circuit, the voltage or current (mA) applied to the S RAM memory card body 2 and the voltage of the power supply 3 V D
D (V), as shown in FIG. 4, the lower operating limit voltage V of the SRAM memory card main body 2
Even below, a current still flows within a certain voltage range, and voltage and current are not immediately applied from the battery 8.

つまり電源3からバッテリ8への電源切換がスムースに
行われがたい。このため、ロス電流が大きく、またバッ
テリ81ごおいては消費電流も大きくなり、バッテリ寿
命が極端に短くなる。
In other words, it is difficult to smoothly switch the power source from the power source 3 to the battery 8. Therefore, the loss current is large, and the current consumption of the battery 81 is also large, resulting in an extremely short battery life.

[発明の構成] (課題を解決するための手段) 本発明は、上記事情に対処してなされたもので、前記S
RAMメモリ用バックアップ回路において、所定の特性
を有するツェナダイオード4と第一の抵抗体5との間に
、所定の抵抗値を有する第二の抵抗体を直列に挿入し、
もって第二のトランジスタ6の出力、即ち第二のトラン
ジスタ6のベース−エミッタ間の電圧V  乃至ベース
ーコB2 レクタ間の電圧■  を電圧降下させ、第一のトE2 ランジスタ1の動作を制御し、電源3とバッテリ8との
電源切換を速やかに行い得るようにしたものである。
[Structure of the Invention] (Means for Solving the Problems) The present invention has been made in response to the above-mentioned circumstances.
In the RAM memory backup circuit, a second resistor having a predetermined resistance value is inserted in series between a Zener diode 4 having predetermined characteristics and a first resistor 5,
As a result, the output of the second transistor 6, that is, the voltage between the base and the emitter of the second transistor 6, or the voltage between the base and the collector is lowered, and the operation of the first transistor 1 is controlled, and the power supply is 3 and the battery 8 can be quickly switched.

(作 用) 上記、本発明の回路構成によれば、S RAMメモリカ
ード本体2の動作時に電源3の電圧が低下した場合、メ
モリ動作下限電圧V  に達したin 時点(動作範囲内)で、第一のトランジスタ1がオフと
なる。つまり電源3からメモリカード本体2への電流供
給に関与する第一のトランジスタ1のベースには、常時
比較的小さい電圧電流が印加されているため、電源3の
電圧低下の影響を敏感に受け、前記第一のトランジスタ
1は容易かつ速やかにオフの状態になる。こうしてメモ
リカード本体2に印加された電圧電流が所定値より低減
乃至低下すると、電源はバッテリ8へと容易かつ、速や
かに切換えられる。
(Function) According to the above-mentioned circuit configuration of the present invention, when the voltage of the power supply 3 drops during operation of the SRAM memory card main body 2, at the point in time when the memory operation lower limit voltage V is reached (within the operating range), First transistor 1 is turned off. In other words, since a relatively small voltage and current is always applied to the base of the first transistor 1 that is involved in supplying current from the power supply 3 to the memory card body 2, it is sensitive to the effects of voltage drops in the power supply 3. The first transistor 1 is easily and quickly turned off. When the voltage and current applied to the memory card body 2 are reduced or lowered below a predetermined value, the power source is easily and quickly switched to the battery 8.

しかして、本発明は上記ツェナダイオードとして、電流
5mAのときツェナ電圧3.1〜3.5Vのものを選択
配設する一方、第二の抵抗体として抵抗値120〜20
0Ωのものを前記ツェナダイオードと第一の抵抗体との
間に直列に挿入接続した場合、上記のような作用効果が
容易にまた、確実に得られるという知見に基づいたもの
である。
Therefore, in the present invention, a Zener diode with a Zener voltage of 3.1 to 3.5 V when the current is 5 mA is selectively disposed, while a second resistor with a resistance value of 120 to 20 V is selected.
This is based on the knowledge that if a 0Ω resistor is inserted and connected in series between the Zener diode and the first resistor, the above effects can be easily and reliably obtained.

(実施例) 以下本発明の詳細な説明する。第1図は本発明に係るS
RAMメモリカード用バックアップ回路例を示す回路図
である。第1図において、1はSRAMメモリカード本
体2と電源3との接続路に配設され、電源3からSRA
Mメモリカード本体2に所要の電圧電流印加に関与する
第一のトランジスタである。また、4は前記第一のトラ
ンジスタ1と電源3との間の接続路に一端が接続するツ
ェナダイオード、6は前記ツェナダイオード4の他端に
直列に接続する第二の抵抗体10及び第一の抵抗体5を
介してベース側が接続され、またコレクタ側が前記第一
のトランジスタ1のベース側に接続した第二のトランジ
スタである。更に8は前記SRAMメモリカード本体2
と第一のトランジスタ1との間の接続路にダイオード7
を介して接続されたバッテリであり、9a、 9bは抵
抗体である。つまり、本発明に係るSRAMメモリカー
ド用バックアップ回路は基本的には従来のSRAMメモ
リカード用バックアップ回路と同様であるが、特に電流
5mAのときツェナ電圧3.1〜3.5Vのツェナダイ
オード4と第一の抵抗体5との間に抵抗値120〜20
0Ωの第二の抵抗体lOを配設して成ることを特徴とし
たSRAMメモリカード用バックアップ回路である。
(Example) The present invention will be described in detail below. FIG. 1 shows the S according to the present invention.
FIG. 2 is a circuit diagram showing an example of a backup circuit for a RAM memory card. In FIG. 1, numeral 1 is arranged in the connection path between the SRAM memory card main body 2 and the power supply 3, and from the power supply 3 to the SRA
This is the first transistor involved in applying the required voltage and current to the M memory card body 2. Further, 4 is a Zener diode whose one end is connected to the connection path between the first transistor 1 and the power supply 3, and 6 is a second resistor 10 and a first resistor connected in series to the other end of the Zener diode 4. This is a second transistor whose base side is connected through the resistor 5 and whose collector side is connected to the base side of the first transistor 1. Furthermore, 8 is the SRAM memory card body 2
A diode 7 is connected between the transistor 1 and the first transistor 1.
9a and 9b are resistors. In other words, the backup circuit for an SRAM memory card according to the present invention is basically the same as the conventional backup circuit for an SRAM memory card. Resistance value 120 to 20 between the first resistor 5
This is a backup circuit for an SRAM memory card characterized by disposing a second resistor lO of 0Ω.

次に上記構成のSRAMメモリカード用バックアップ回
路の動作に就いて説明する。電源3の電圧が所定値以上
にあると、ツェナダイオード4、第二の抵抗体10及び
第一の抵抗体5を介して、所定の電圧乃至電流が第二の
トランジスタ6のベース側に加えられる。この際第二の
抵抗体IOをさらに直列に挿入しであるため、第二のト
ランジスタ6のベース側に加えられる電圧電流は低減さ
れている。つまり第二のトランジスタ6の入出力は比較
的小さいため、敏感に応答、動作するようになり、第一
のトランジスタ1を敏感に制御する。かくして電源3の
電圧が、SRAMメモリカード本体2の動作電圧にある
範囲内(動作下限値v11□以上)では、第一のトラン
ジスタ1はオン状態を呈し、前記電源3からSRAMメ
モリカード本体2に所要の電圧電流を供給し、SRAM
メモリカード本体2は所要の駆動乃至動作をなす。一方
、電源3の電圧が所定値以下になると、ツェナダイオー
ド4の電流は低減乃至遮断されるため、第二のトランジ
スタ6も動作しなくなる。この際、第二のトランジスタ
5のベース側に供給されている電圧電流は比較的小さい
ため、前記電源電圧の低下は、容易に第二のトランジス
タ6及び第一のトランジスタ1に影響し、電源3とSR
AMメモリカード本体2との間の電気的な接続を容易か
つ、速やかに遮断する。上記SRAMメモリカード本体
2に電源3から所要の電圧電流が印加されなくなると、
バッテリ8からダオード7を介して所要の駆動電圧がS
RAMメモリカード本体2に速やかに印加され、所定の
動作を続行する。
Next, the operation of the SRAM memory card backup circuit having the above configuration will be explained. When the voltage of the power supply 3 is above a predetermined value, a predetermined voltage or current is applied to the base side of the second transistor 6 via the Zener diode 4, the second resistor 10, and the first resistor 5. . At this time, since the second resistor IO is further inserted in series, the voltage and current applied to the base side of the second transistor 6 is reduced. In other words, since the input and output of the second transistor 6 is relatively small, it responds and operates sensitively, and controls the first transistor 1 sensitively. Thus, when the voltage of the power supply 3 is within the range of the operating voltage of the SRAM memory card main body 2 (above the lower operating limit value v11 Supplying the required voltage and current, SRAM
The memory card main body 2 performs the required driving or operation. On the other hand, when the voltage of the power supply 3 becomes lower than a predetermined value, the current of the Zener diode 4 is reduced or cut off, so that the second transistor 6 also stops operating. At this time, since the voltage and current supplied to the base side of the second transistor 5 is relatively small, the drop in the power supply voltage easily affects the second transistor 6 and the first transistor 1, and the power supply 3 and S.R.
To easily and quickly cut off electrical connection with an AM memory card main body 2. When the required voltage and current are no longer applied to the SRAM memory card body 2 from the power supply 3,
The required driving voltage is S from the battery 8 via the diode 7.
The voltage is immediately applied to the RAM memory card main body 2, and the predetermined operation continues.

第2図は上記本発明に係る回路について、SRAMメモ
リカード本体2に印加される電圧乃至電流(mA)と電
源3の電圧V、D(V)との関係を示す特性図である。
FIG. 2 is a characteristic diagram showing the relationship between the voltage or current (mA) applied to the SRAM memory card body 2 and the voltages V and D (V) of the power supply 3 for the circuit according to the present invention.

第2図から分るように、電源3の電圧がSRAMメモリ
カード本体2の動作下限値V  以下になると、SRA
Mメモリカーin ド本体2側に流れる電流1 cc(sA)は微小で、こ
のことは、電源がバッテリ8に容易かつ、速やかに切換
えられることを如実に示している。
As can be seen from FIG. 2, when the voltage of the power supply 3 becomes below the operating lower limit value V of the SRAM memory card body 2
The current 1 cc (sA) flowing into the M memory card main body 2 side is very small, which clearly shows that the power source can be easily and quickly switched to the battery 8.

[発明の効果] 上記実施例から分るように、本発明に係るSRAMメモ
リ用バックアップ回路によれば、SRAMメモリカード
本体が動作している時に、何らかの原因で電源電圧が低
下し、SRAMメモリカード本体の動作下限値V  に
達すると速やln かに主電源回路は遮断しく第一のトランジスタ1がオフ
)、動作電源は速やかにバッテリに切替わり、所要のバ
ックアップが行われる。このためバッテリの消費電力も
最小限に押えることも可能で、それだけバッテリの長寿
命化を図りうる。しかも電源検出回路等の付設も要しな
いため、回路構成も複雑化せず、ローコストに押えるこ
とができ、実用面では多くの利点をもたらすものと言え
る。
[Effects of the Invention] As can be seen from the above embodiments, according to the SRAM memory backup circuit according to the present invention, when the SRAM memory card main body is operating, the power supply voltage decreases for some reason, and the SRAM memory card As soon as the lower operating limit value V of the main body is reached, the main power supply circuit is immediately cut off and the first transistor 1 is turned off), the operating power source is immediately switched to the battery, and the necessary backup is performed. Therefore, the power consumption of the battery can also be kept to a minimum, and the life of the battery can be extended accordingly. In addition, since it is not necessary to provide a power supply detection circuit, the circuit configuration is not complicated and costs can be kept low, and it can be said that it brings many advantages in practical terms.

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

第1図は本発明のSRAMメモリ用バックアップ回路の
構成例を示す回路図、第2図は第1図の回路における電
源電圧とSRAMメモリカード本体側への出力電流との
関係を示す特性図、第3図は従来のSRAMメモリ用バ
ックアップ回路の構成例を示す回路図、第4図は第3図
の回路における電源電圧とSRAMメモリカード本体側
への出力電流との関係を示す特性図である。 1・・・第一のトランジスタ 2・・・SRAMメモリカード本体 3・・・電源 4・・・ツェナダイオード 5・・・第一の抵抗体 6・・・第二のトランジスタ 7・・・ダイオード 8・・・バッテリ 10・・・第二の抵抗体 出願人      株式会社 東芝 同        東芝回路部品エンジニアリング株式
会社 代理人 弁理士  須 山 佐 −
FIG. 1 is a circuit diagram showing a configuration example of a backup circuit for SRAM memory of the present invention, FIG. 2 is a characteristic diagram showing the relationship between the power supply voltage and the output current to the SRAM memory card main body side in the circuit of FIG. 1, FIG. 3 is a circuit diagram showing a configuration example of a conventional SRAM memory backup circuit, and FIG. 4 is a characteristic diagram showing the relationship between the power supply voltage and the output current to the SRAM memory card main body side in the circuit of FIG. 3. . 1... First transistor 2... SRAM memory card body 3... Power supply 4... Zener diode 5... First resistor 6... Second transistor 7... Diode 8 ...Battery 10...Second resistor applicant Toshiba Corporation Toshiba Circuit Components Engineering Co., Ltd. Agent Patent attorney Sasu Suyama -

Claims (1)

【特許請求の範囲】 SRAMメモリカード本体と電源との接続路に配設され
た第一のトランジスタと、 前記第一のトランジスタと電源との間の接続路に一端が
接続するツェナダイオードと、 前記ツェナダイオードの他端に第一の抵抗体を介してベ
ース側が接続され、またコレクタ側が前記第一のトラン
ジスタのベース側に接続した第二のトランジスタと、 前記SRAMメモリカード本体と第一のトランジスタと
の間の接続路にダイオードを介して接続されたバッテリ
と、 前記ツェナダイオードと第一の抵抗体との間に配設され
た第二の抵抗体とを具備して成り、前記ツェナダイオー
ドは電流5mAとしたときツェナ電圧3.1〜3.5V
で、第二の抵抗体の抵抗値が120〜200Ωであるこ
とを特徴とするSRAMメモリカード用バックアップ回
路。
[Scope of Claims] A first transistor disposed in a connection path between the SRAM memory card body and the power source; a Zener diode having one end connected to the connection path between the first transistor and the power source; a second transistor whose base side is connected to the other end of the Zener diode via a first resistor, and whose collector side is connected to the base side of the first transistor; and the SRAM memory card main body and the first transistor. and a second resistor disposed between the Zener diode and the first resistor, and the Zener diode has a current Zener voltage 3.1 to 3.5V when set to 5mA
A backup circuit for an SRAM memory card, wherein the second resistor has a resistance value of 120 to 200Ω.
JP63293330A 1988-11-18 1988-11-18 Backup circuit for sram memory card Pending JPH02139649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63293330A JPH02139649A (en) 1988-11-18 1988-11-18 Backup circuit for sram memory card

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63293330A JPH02139649A (en) 1988-11-18 1988-11-18 Backup circuit for sram memory card

Publications (1)

Publication Number Publication Date
JPH02139649A true JPH02139649A (en) 1990-05-29

Family

ID=17793424

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63293330A Pending JPH02139649A (en) 1988-11-18 1988-11-18 Backup circuit for sram memory card

Country Status (1)

Country Link
JP (1) JPH02139649A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998030950A1 (en) * 1997-01-14 1998-07-16 Citizen Watch Co., Ltd. Power supply switching circuit for portable equipment
US7806872B2 (en) 1998-06-04 2010-10-05 Biosense Webster, Inc. Injection catheter with needle stop
US7905864B2 (en) 1998-06-04 2011-03-15 Biosense Webster, Inc. Injection catheter with multi-directional delivery injection needle
US8079982B1 (en) 1998-06-04 2011-12-20 Biosense Webster, Inc. Injection catheter with needle electrode
WO2020230415A1 (en) 2019-05-10 2020-11-19 株式会社Lake・E2 Injection tool for endoscope

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998030950A1 (en) * 1997-01-14 1998-07-16 Citizen Watch Co., Ltd. Power supply switching circuit for portable equipment
US6060789A (en) * 1997-01-14 2000-05-09 Citizen Watch Co., Ltd. Power supply switching circuit for portable equipment
US7806872B2 (en) 1998-06-04 2010-10-05 Biosense Webster, Inc. Injection catheter with needle stop
US7905864B2 (en) 1998-06-04 2011-03-15 Biosense Webster, Inc. Injection catheter with multi-directional delivery injection needle
US8079982B1 (en) 1998-06-04 2011-12-20 Biosense Webster, Inc. Injection catheter with needle electrode
US8977344B2 (en) 1998-06-04 2015-03-10 Biosense Webster, Inc. Injection catheter with needle electrode
WO2020230415A1 (en) 2019-05-10 2020-11-19 株式会社Lake・E2 Injection tool for endoscope
KR20220007133A (en) 2019-05-10 2022-01-18 가부시키가이샤 레이크.이2 endoscopic syringe

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