JPS6190517A - Semiconductor switch drive circuit - Google Patents

Semiconductor switch drive circuit

Info

Publication number
JPS6190517A
JPS6190517A JP21129684A JP21129684A JPS6190517A JP S6190517 A JPS6190517 A JP S6190517A JP 21129684 A JP21129684 A JP 21129684A JP 21129684 A JP21129684 A JP 21129684A JP S6190517 A JPS6190517 A JP S6190517A
Authority
JP
Japan
Prior art keywords
transistor
switch
resistor
control signal
input terminal
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.)
Granted
Application number
JP21129684A
Other languages
Japanese (ja)
Other versions
JPH0342811B2 (en
Inventor
Yasunobu Inabe
井鍋 泰宣
Masaaki Tanabe
田辺 雅秋
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP21129684A priority Critical patent/JPS6190517A/en
Publication of JPS6190517A publication Critical patent/JPS6190517A/en
Publication of JPH0342811B2 publication Critical patent/JPH0342811B2/ja
Granted legal-status Critical Current

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  • Thyristor Switches And Gates (AREA)

Abstract

PURPOSE:To reduce power consumption of a drive circuit while a switch is turned off by connecting the 4th resistor and plural P-N junctions between the 1st constant potential point and the 2nd constant potential point and connecting a connecting point between the 4th resistor and the P-N junction elements to the base of the 3rd transistor (TR) so as to stop the operation of a gate current generating section when a control signal is at a high level. CONSTITUTION:Not only ON/OFF control of TRs 21, 22 but the ON/OFF control of a gate current generating section are attained by a control signal supplied from a switch control signal input terminal 2. That is, a high level control signal voltage is fed to the signal input terminal 2 when a switch 6 is turned off. Thus, TRs 12, 21, 22 are all turned off and no current flows to the TRs. Further, no current flows to resistors 8, 27. Although a bias current flows to a resistor 26 and diodes 24, 25, the bias current is as small as 0.1mA, and the power consumption while the switch 6 is turned off is as small as nearly 0.5mW, which is 1/10 or below the conventional circuit.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は電力消費が小である半導体スイッチ駆動回路に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a semiconductor switch drive circuit with low power consumption.

(従来技術) 大電流あるいは高電圧をスイッチング制御できる半導体
スイッチとして、従来よ!J PMPIJ 4層構造の
スイッチ(以下PNPNスイッチと略記する)がよく用
いられている。第3図はこの種のPNPNスイッチと、
そのゲート駆動回路を示すものであって、6はPNPN
スイッチ、3,4.5は各々該スイッチの7ノード端子
、カンード端子、ゲート端子を示している。また、lは
正電圧源(通常は+5V、以下V。。と略す)を接続す
る端子であり、2はスイッチ制御信号入力端子である。
(Prior art) As a semiconductor switch that can control switching of large current or high voltage, it is conventional! J PMPIJ A switch with a four-layer structure (hereinafter abbreviated as a PNPN switch) is often used. Figure 3 shows this type of PNPN switch,
6 shows the gate drive circuit, and 6 is PNPN.
Switches 3 and 4.5 respectively indicate the 7 node terminal, cando terminal, and gate terminal of the switch. Further, l is a terminal to which a positive voltage source (usually +5V, hereinafter abbreviated as V) is connected, and 2 is a switch control signal input terminal.

第3図においてスイッチ6をオフ状態からオン状態へと
転するには制御信号入力端子に印加する信号電圧をハイ
レベル(通常+5V)にする。これによシトランジスタ
20および12がオン°となり、ダイオード13を介し
てスイッチ6のゲートへ  I。=”+2・(2Vn−
Vnt)/Ro  ・・・−(1)なるゲート電流工G
が供給され、スイッチ6はオンへ転する。ここでα12
はトランジスタ12のベース接地電流増・幅率、vT3
はダイオード9あるいはlOの導通電圧、V□はトラン
ジスタ12のペース・エミッタIffj電圧、R11は
抵抗llの値である。また端子2へ印加する信号レベル
はいわゆるDTL (Diode Traneist、
or Logic) レベルと同じものでよく、ハイレ
ベルが+5V程度、ロウレベル−1)ZOV程度、閾電
圧が1.2 V程度である。
In FIG. 3, in order to turn the switch 6 from an off state to an on state, the signal voltage applied to the control signal input terminal is set to a high level (usually +5V). This turns on transistors 20 and 12, and leads to the gate of switch 6 via diode 13. =”+2・(2Vn−
Vnt)/Ro...-(1) Gate current engineering G
is supplied, and the switch 6 is turned on. Here α12
is the common base current amplification/width ratio of transistor 12, vT3
is the conduction voltage of diode 9 or lO, V□ is the pace emitter Iffj voltage of transistor 12, and R11 is the value of resistor ll. Also, the signal level applied to terminal 2 is so-called DTL (Diode Traneist,
The high level is about +5V, the low level is about -1)ZOV, and the threshold voltage is about 1.2V.

(発明が解決しようとする問題点) しかるに第3図のごとき従来回路では以下のような3つ
の欠点があった。
(Problems to be Solved by the Invention) However, the conventional circuit shown in FIG. 3 has the following three drawbacks.

(イ)スイッチ6がオフである期間中も(すなわち端子
2の電圧がOv程度のとき)正電圧源(〜5v)1→抵
抗14→ダイオ一ド15→信号入力端子2−図の外部、
の経路でもって電流が流れる。この電流の値は抵抗14
が通常5にΩ程度であるので、約1mAとなり、このた
め5mW程度の電力が消費される。
(a) Even during the period when the switch 6 is off (that is, when the voltage at the terminal 2 is about Ov), the positive voltage source (~5V) 1 → the resistor 14 → the diode 15 → the signal input terminal 2 - the outside of the diagram,
Current flows through the path. The value of this current is the resistance 14
Since the current is normally about 5Ω, the current is about 1 mA, and therefore about 5 mW of power is consumed.

C口)スイッチ6がオフである期間中の信号入力端子2
における入力信号の雑音余裕は約1.2v(上述の閾値
に相当する)と、小さい。
C) Signal input terminal 2 during the period when switch 6 is off
The noise margin of the input signal at is small, about 1.2v (corresponding to the above-mentioned threshold).

(ハ)スイッチ6がオフである期間中に、第3図におい
て、図の外部から信号入力端子2に到る信号線が障害に
′よシ切断されてしまうと、(すなわち端子がオーブン
となると)これは制御入力信号が・・イレベーとなるの
と等価であ  5[シ、スイッチ6が誤点弧してしまう
。(いわゆるフェイルアウト(Fail Out )で
ある。)第4図は上記の欠点のうち(ロ)と(ハ)の欠
点を除去するための従来回路の他の例である。第4図で
は制御信号入力端子2に印加される信号電圧がロウレベ
ル(〜Ov)のときにトランジスタ21がオンでトラン
ジスタ22がオフとなシ、ダイオード13を介して、前
記(1)式で与えられるゲート電流ちがスイッチ6のゲ
ートへ供給される。誤信号電圧がハイレベル(〜+5V
)のときはトランジスタ21がオフで、トランジスタ2
2がオンとなシ、電流工。はトランジスタ22の側を流
れ、スイッチ6のゲートへは供給されない。信号入力端
子2における制御信号電圧の閾値(すなわちトランジス
タ21と22が切シ換わる信号電圧値)は、およそ2 
X Vl)’ (Vp’はダイオード24あるいは25
の導通電圧)=1.2Vであるので、スイッチ6がオフ
状態にあるときの雑音余裕は、 (入力信号のハイレベル%j圧) −2X VD′年5
−1.2==3.8 v と、第3図のものと比較して3倍も大きい。
(c) If the signal line from the outside to the signal input terminal 2 in FIG. 3 is cut off due to a fault while the switch 6 is off (in other words, if the terminal becomes an oven), ) This is equivalent to the control input signal becoming ``Ilevate'', and the switch 6 will fire incorrectly. (This is a so-called failout.) FIG. 4 shows another example of a conventional circuit for eliminating the drawbacks (b) and (c) of the above-mentioned drawbacks. In FIG. 4, when the signal voltage applied to the control signal input terminal 2 is at a low level (~Ov), the transistor 21 is on and the transistor 22 is off. The gate current supplied to the switch 6 is supplied to the gate of the switch 6. Erroneous signal voltage is high level (~+5V
), transistor 21 is off and transistor 2
2 is on, electrician. flows through the transistor 22 and is not supplied to the gate of the switch 6. The threshold value of the control signal voltage at signal input terminal 2 (i.e., the signal voltage value at which transistors 21 and 22 switch) is approximately 2
X Vl)'(Vp' is diode 24 or 25
conduction voltage) = 1.2V, so the noise margin when switch 6 is in the off state is (high level %j voltage of input signal) -2X VD'5
−1.2==3.8 v, which is three times larger than that in FIG.

まだ、図の外部から端子2に到る信号配線が切断される
ような障害が生じた場合、(すなわち端子2がオープン
となった場合)トランジスタ21は常にオフ状態となる
。従って、スイッチ6は制御信号でもってオンすること
ができなくなるが、これはいわゆる7エイルセーフ(F
ail 5afe)であシ、第3図のものが7エイルア
ウト(Fail Out )であったことに比べると好
ましいものである。
However, if a failure such as disconnection of the signal wiring from the outside to the terminal 2 occurs (that is, if the terminal 2 becomes open), the transistor 21 is always in an off state. Therefore, the switch 6 cannot be turned on by the control signal, but this is a so-called 7 fail safe (F
This is preferable compared to the case shown in FIG. 3, which had 7 fail outs.

しかしながら、第4図の構成ではスイッチ6のオフ期間
中も、ゲート電流ちがトランジスタ22を介して流れる
。工。は通常1mA程度に設定し、またダイオード9,
10を流れるバイアス電流も1mA程度に設定するので
、第4図の構成においては、スイッチのオン/オフに拘
らず、常時10mW程度の電力を消費していた。
However, in the configuration of FIG. 4, the gate current flows through the transistor 22 even during the off period of the switch 6. Engineering. is usually set to about 1mA, and the diode 9,
Since the bias current flowing through the switch 10 is also set to about 1 mA, the configuration shown in FIG. 4 always consumes about 10 mW of power regardless of whether the switch is on or off.

(問題点を解決するための手段) 本発明は上記の欠点を除去するために提案されたもので
、制御信号がハイレベルにあるときはゲート電流作成部
の動作を停止するようにし、これ−によシスイッチがオ
フ状態にある期間は、駆動回路の電力消費を低減するよ
うにした半導体スイッチ駆動回路を提供することを目的
とする。
(Means for Solving the Problems) The present invention has been proposed to eliminate the above-mentioned drawbacks, and when the control signal is at a high level, the operation of the gate current generation section is stopped. An object of the present invention is to provide a semiconductor switch drive circuit in which the power consumption of the drive circuit is reduced during the period when the switch is in the off state.

次に本発明の詳細な説明する。なお実施例は一つの例示
であって、本発明の精神を逸脱しない範囲で、社々の変
更あるいは改良を行いうろことは云うまでもない。
Next, the present invention will be explained in detail. It should be noted that the embodiments are merely illustrative, and it goes without saying that modifications and improvements may be made without departing from the spirit of the present invention.

第1図は本発明の半導体スイッチ駆動回路の第1の実施
例を示す。
FIG. 1 shows a first embodiment of a semiconductor switch drive circuit according to the present invention.

図において、1は第1の定電位点であシ、第1のトラン
ジスタ12のエミッタを第1の抵抗11を介して第1の
定電位点lに接続し、トランジスタ12のベースと第1
0定m位点との間にダイオード9.lOを接続する。ま
た第1の定電位点1とスイッチ制御信号入力端子2との
間に第2.第3の抵抗8.27を接続し、両抵抗の接続
点を第1のトランジスタ12のベースに接続し、第1の
トランジスタ12のコレクタを夫々第2.第3のトラン
ジスタ21.22のエミッタに接続し、この第2のトラ
ンジスタ22のベースをスイッチ制御信号入力端子2に
接続し、コレクタをダイオード13を介して半導体スイ
ッチ6のゲート端子5に接続する。第3のトランジスタ
22のコレクタを第2の定電位点に接続する。又第1及
び第2の定電位点との間に第4の抵抗26とダイオード
24゜25を直列に挿入し、抵抗26とダイオード24
の接続点を第3のトランジスタ22のベースに接続する
In the figure, 1 is the first constant potential point, and the emitter of the first transistor 12 is connected to the first constant potential point l via the first resistor 11, and the base of the transistor 12 and the first
A diode 9. Connect lO. Further, a second terminal is connected between the first constant potential point 1 and the switch control signal input terminal 2. A third resistor 8.27 is connected, the connection point of both resistors is connected to the base of the first transistor 12, and the collector of the first transistor 12 is connected to the second . It is connected to the emitter of a third transistor 21 , 22 , its base is connected to the switch control signal input terminal 2 , and its collector is connected via a diode 13 to the gate terminal 5 of the semiconductor switch 6 . The collector of the third transistor 22 is connected to the second constant potential point. Also, a fourth resistor 26 and a diode 24°25 are inserted in series between the first and second constant potential points.
is connected to the base of the third transistor 22.

第1図は第4図において、スイッチ制御信号入力端子2
に印加する制御信号でもってトランジスタ21と22の
オン/オフ制御のみならず、ダイオード9,10.抵抗
11及びトランジスタ12から成るゲート電流作成部の
オン/オフ制御もできるようにしたものである。すなわ
ちスイッチ6のオフ時には第4図と同様、信号入力端子
2にはハイレベル(αvo。α5V)の制御信号電圧が
印加されている。従って、トランジスタ12 、212
2はすべてオフであシ、これらのトランジスタには電流
が流れない。また抵抗8と27にも電流は流れない。抵
抗26とダイオード24.25にはバイアス電流が流れ
るが、該バイアス電流は端子2に印加する入力電圧に閾
値を与えるため抵抗27に導通電圧を発生するのが目的
であるから、高々0.1 mA程度でよく、このためス
イッチ6がオフである期間中の電力消費は約0.5 m
Wと、従来よシもl/lO以下で済む。
Figure 1 shows the switch control signal input terminal 2 in Figure 4.
The control signal applied to not only controls the on/off of transistors 21 and 22 but also controls the diodes 9, 10 . It is also possible to control on/off of a gate current generating section consisting of a resistor 11 and a transistor 12. That is, when the switch 6 is off, a high level (αvo, α5V) control signal voltage is applied to the signal input terminal 2, as in FIG. 4. Therefore, transistors 12, 212
All transistors 2 are off, and no current flows through these transistors. Also, no current flows through the resistors 8 and 27. A bias current flows through the resistor 26 and the diodes 24 and 25, but the purpose of this bias current is to generate a conduction voltage in the resistor 27 in order to provide a threshold value to the input voltage applied to the terminal 2, so the bias current is 0.1 at most. It only takes about mA, so the power consumption during the period when switch 6 is off is about 0.5 mA.
W and conventional methods require less than l/lO.

さて、スイッチ制御信号入力端子2にお、ける制御入力
信号電圧vinをハイレベル(α5V)から下げてゆく
と、vi nがV。。−vvに等しくなるとダイオード
9〜トランジスタ12から成る定電流作成回路が作動し
始め、vioがvo。−2v1)になると(1)式で与
えられる工。がトランジスタ22の側を流れる。さらに
vinを下げて、2・vD′以下となるとトランジスタ
21がオン、トランジスタ22がオフとなって、工。は
トランジスタ21とダイオード13を介してスイッチ6
のゲートへと流れる。
Now, when the control input signal voltage vin at the switch control signal input terminal 2 is lowered from the high level (α5V), vin becomes V. . When it becomes equal to -vv, the constant current generating circuit consisting of diode 9 to transistor 12 starts to operate, and vio becomes vo. -2v1), the force given by equation (1). flows on the transistor 22 side. When vin is further lowered and becomes less than 2.vD', transistor 21 is turned on and transistor 22 is turned off, causing the operation to proceed. is connected to the switch 6 via the transistor 21 and the diode 13.
flowing to the gate.

つまシ、第1図の制御入力信号電圧の閾値は第4図と同
じであり、雑音余裕も同じである。さらに信号線切断時
においてフェイルセーフとなる点も第4図と同様である
The threshold value of the control input signal voltage in FIG. 1 is the same as in FIG. 4, and the noise margin is also the same. Furthermore, it is similar to FIG. 4 in that it is fail-safe when the signal line is disconnected.

第2図は本発明の第2の実施例であって、第1図におけ
る制御入力電流を小さくするように工夫を施したもので
ある。この回路では、第4のトランジスタ28のベース
をスイッチ制御信号入力端子2に接続し、エミッタを第
3の抵抗27の一方の端子及び第2のトランジスタ21
のベースに接続し、コレクタを第3の定電位点に接続し
た点に特徴を有するものである。
FIG. 2 shows a second embodiment of the present invention, in which the control input current in FIG. 1 has been devised to be smaller. In this circuit, the base of the fourth transistor 28 is connected to the switch control signal input terminal 2, and the emitter is connected to one terminal of the third resistor 27 and the second transistor 21.
It is characterized in that the collector is connected to the base of the collector and the collector is connected to the third constant potential point.

第1図ではスイッチ6がオンである期間中の制御入力電
流エエ、は制御入力電圧のロウレベルが約Ovであるこ
とから、 工KL C: (Too  2 Vv ) / RlF
であるが、第2図では、 工XL = (voo  ” VD )/βzs e 
R17である。
In Fig. 1, the control input current during the period when the switch 6 is on is expressed as follows, since the low level of the control input voltage is approximately Ov.
However, in Figure 2, XL = (voo ” VD )/βzse
It is R17.

ただしβ1.はトランジスタ28のエミッタ接地電流増
幅率でありRlFは抵抗27の値である。すなわち第1
図と比べて、エエ、を1/β2゜に小さくできる。
However, β1. is the common emitter current amplification factor of the transistor 28, and RlF is the value of the resistor 27. That is, the first
Compared to the figure, E can be reduced to 1/β2°.

その他覚力消費、雑音余裕、および制御信号切断時の7
エイルセーフに関しては第1図と同じであるので、説明
を省略する。
Other factors such as power consumption, noise margin, and control signal disconnection 7
Since the failsafe is the same as in FIG. 1, the explanation will be omitted.

(発明の効果) 叙上のように、本発明によれば牛導体スイッチがオフで
ある期+i41の駆動回路の消費電力を低減できるので
、竹にスイッチマトリックスのように多数のスイッチ及
びその駆動回路を1チツプ上に集積化するときに有効で
ある。
(Effects of the Invention) As described above, according to the present invention, it is possible to reduce the power consumption of the +i41 drive circuit when the conductor switch is off. This is effective when integrating on one chip.

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

第1図と第2図は本発明の半導体スイッチ駆動回路の実
施例、第3図と第4図は従来の半導体スイッチの回路図
を示す。 l・・定電位点、2・・・スイッチ制御信号入力端子、
3.4.5・・・端子、9.10.13.24.25゜
29・・・ダイオード、12.21.22.28・・・
第1、第2.第3.第4のトランジスタ、11,8゜2
7 、26・・・第1.第2.第3.第4の抵抗特許出
願0人 第1図 11.8.27.26  f+、ボ2.ヤ3.ヤ今/1
才谷a6、!P導・体ズイー/4− 第2図
1 and 2 show an embodiment of the semiconductor switch drive circuit of the present invention, and FIGS. 3 and 4 show circuit diagrams of a conventional semiconductor switch. l... constant potential point, 2... switch control signal input terminal,
3.4.5...Terminal, 9.10.13.24.25°29...Diode, 12.21.22.28...
1st, 2nd. Third. Fourth transistor, 11,8°2
7, 26... 1st. Second. Third. Fourth Resistance Patent Applicant 0 people 1st Figure 11.8.27.26 f+, Bo 2. Ya3. Ya now/1
Saitani a6! P conductor/Body ZI/4- Fig. 2

Claims (2)

【特許請求の範囲】[Claims] (1)第1のトランジスタのエミッタを第1の抵抗を介
して第1の定電位点に接続すると共に、前記の定電位点
と前記の第1のトランジスタのベースとの間に複数のp
n接合素子を接続し、前記の第1の定電位点とスイッチ
制御信号入力端子との間に第2及び第3の抵抗との直列
素子を接続し、前記の両抵抗の接続点を前記の第1のト
ランジスタのベースに接続し、前記の第1のトランジス
タのコレクタを夫々第2、第3のトランジスタのエミッ
タに接続し、前記の第2のトランジスタのベースを前記
のスイッチ制御信号入力端子に接続し、コレクタをpn
接合素子を介して半導体スイッチ素子のゲートに接続す
ると共に、前記の第3のトランジスタのコレクタを第2
の定電位点に接続し、かつ前記の第1の定電位点と第2
の定電位点との間に第4の抵抗と複数のpn接合素子を
接続し、前記の第4の抵抗とpn接合素子との接続点を
前記の第3のトランジスタのベースに接続したことを特
徴とする半導体スイッチ駆動回路。
(1) The emitter of the first transistor is connected to a first constant potential point via a first resistor, and a plurality of p
An n-junction element is connected, a series element with a second and third resistor is connected between the first constant potential point and the switch control signal input terminal, and a connection point between the two resistors is connected to the switch control signal input terminal. The collector of the first transistor is connected to the emitters of the second and third transistors, respectively, and the base of the second transistor is connected to the switch control signal input terminal. Connect and pn the collector
The third transistor is connected to the gate of the semiconductor switching element via the junction element, and the collector of the third transistor is connected to the second transistor.
the first constant potential point and the second constant potential point.
A fourth resistor and a plurality of pn junction elements are connected between the constant potential point of the fourth resistor and the pn junction element, and a connection point between the fourth resistor and the pn junction element is connected to the base of the third transistor. Characteristic semiconductor switch drive circuit.
(2)第4のトランジスタのベースをスイッチ制御信号
入力端子に接続し、エミッタを第3の抵抗の一方端子及
び第2のトランジスタのベースに接続し、コレクタを第
3の定電位点に接続したことを特徴とする特許請求の範
囲第1項記載の半導体スイッチ駆動回路。
(2) The base of the fourth transistor was connected to the switch control signal input terminal, the emitter was connected to one terminal of the third resistor and the base of the second transistor, and the collector was connected to the third constant potential point. A semiconductor switch drive circuit according to claim 1, characterized in that:
JP21129684A 1984-10-11 1984-10-11 Semiconductor switch drive circuit Granted JPS6190517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21129684A JPS6190517A (en) 1984-10-11 1984-10-11 Semiconductor switch drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21129684A JPS6190517A (en) 1984-10-11 1984-10-11 Semiconductor switch drive circuit

Publications (2)

Publication Number Publication Date
JPS6190517A true JPS6190517A (en) 1986-05-08
JPH0342811B2 JPH0342811B2 (en) 1991-06-28

Family

ID=16603585

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21129684A Granted JPS6190517A (en) 1984-10-11 1984-10-11 Semiconductor switch drive circuit

Country Status (1)

Country Link
JP (1) JPS6190517A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5075406A (en) * 1988-03-08 1991-12-24 Mitsui Toatsu Chemicals, Inc. Process for refining 1,3-dimethyl-2-imidazolidinone
JP2002524010A (en) * 1998-08-12 2002-07-30 ダイムラークライスラー・アクチェンゲゼルシャフト Apparatus for controlling voltage-charge control power semiconductor device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5686529A (en) * 1979-12-17 1981-07-14 Fujitsu Ltd Current switching type pulse output circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5686529A (en) * 1979-12-17 1981-07-14 Fujitsu Ltd Current switching type pulse output circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5075406A (en) * 1988-03-08 1991-12-24 Mitsui Toatsu Chemicals, Inc. Process for refining 1,3-dimethyl-2-imidazolidinone
JP2002524010A (en) * 1998-08-12 2002-07-30 ダイムラークライスラー・アクチェンゲゼルシャフト Apparatus for controlling voltage-charge control power semiconductor device

Also Published As

Publication number Publication date
JPH0342811B2 (en) 1991-06-28

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