DE1129533B - Bistable multivibrator - Google Patents
Bistable multivibratorInfo
- Publication number
- DE1129533B DE1129533B DEM49284A DEM0049284A DE1129533B DE 1129533 B DE1129533 B DE 1129533B DE M49284 A DEM49284 A DE M49284A DE M0049284 A DEM0049284 A DE M0049284A DE 1129533 B DE1129533 B DE 1129533B
- Authority
- DE
- Germany
- Prior art keywords
- capacitor
- operating voltage
- bistable multivibrator
- multivibrator
- transistor
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
- H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
- H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
- H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
- H03K3/2865—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable ensuring a predetermined initial state when the supply voltage has been applied; storing the actual state when the supply voltage fails
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
- H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
- H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
- H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Description
Wird ein bistabiler Multivibrator an die Betriebsspannung geschaltet, so ist es bekannt, daß er im Augenblick der Anschaltung jeden der beiden möglichen Zustände einnehmen kann. Welcher der beiden Zustände im Augenblick der Anschaltung eingenommen wird, hängt von im Augenblick der Anschaltung bestehenden Zufälligkeiten ab. Um nun zu erreichen, daß ein solcher bistabiler Multivibrator bei der Anschaltung an die Betriebsspannungsquelle jedesmal einen fest definierten Ausgangszustand einnimmt, ist es bekannt, zwischen den einen Pol der Betriebsspannungsquelle und der Steuerelektrode eines der beiden Verstärkerelemente eines solchen Multivibrators einen Kondensator zu schalten, dessen Ladestrom derart auf das betreffende Verstärkungselement einwirkt, daß dieser bistabile Multivibrator stets die jeweils gewünschte Ausgangslage erhält.If a bistable multivibrator is connected to the operating voltage, it is known that it is in the Moment of connection can assume either of the two possible states. Which of the two States taken at the moment of connection depends on the moment of connection existing coincidences. In order to achieve that such a bistable multivibrator at the connection to the operating voltage source assumes a permanently defined initial state each time, it is known between the one pole of the operating voltage source and the control electrode of one of the two amplifier elements of such a multivibrator to switch a capacitor, its charging current acts in such a way on the reinforcing element in question that this bistable multivibrator always the receives the desired starting position.
Der Nachteil einer solchen Anordnung besteht aber darin, daß bei etwaigen Prellungen des die Betriebsspannung anschaltenden Schalters beim ersten Schließen des betreffenden Schalters der Kondensator geladen wird und sich bei dem durch Prellungen des Schalters verursachten kurzzeitigen Öffnen des Kontaktes nicht schnell genug entladen kann. Wird dann der Schaltkontakt erneut geschlossen, so ist der Kondensator noch geladen, und es fließt nunmehr kein Strom in die Steuerelektrode des dem Kondensator zugeordneten Verstärkungselementes, so daß wiederum der Fall entsteht, daß die bistabile Schaltung einen ihrer beiden möglichen Zustände einnehmen wird, ohne daß von vornherein feststeht, um welchen Zustand es sich jeweils handelt.The disadvantage of such an arrangement is that in the event of any bruises of the Operating voltage switching on switch when first closing the switch in question, the capacitor is charged and when the switch is opened briefly due to bouncing of the switch of the contact cannot discharge quickly enough. If the switching contact is then closed again, so the capacitor is still charged and no current flows into the control electrode of the dem Capacitor associated gain element, so that in turn the case arises that the bistable Circuit will assume one of its two possible states without it being certain from the start, which state it is in each case.
Die Erfindung bezieht sich nun ebenfalls auf einen bistabilen Multivibrator, der durch den Ladestrom eines mit der Steuerelektrode eines der beiden Verstärkerelemente des Multivibrators gekoppelten Kondensators bei der Einschaltung der Betriebsspannung immer den gleichen Ausgangszustand einnimmt, und beseitigt den oben geschilderten Nachteil bekannter Anordnungen dadurch, daß der mit einer Belegung an den einen Pol der Betriebsspannungsquelle angeschaltete Kondensator mit seiner anderen Belegung über eine für den Entladestrom des Kondensators durchlässige Diode unmittelbar mit dem anderen Pol der Betriebsspannungsquelle verbunden ist. Dadurch ist es möglich, daß bei einem kurzzeitigen Öffnen des Schaltkontaktes, der die Betriebsspannung abschaltet, der Kondensator sich über diese Diode sowie über alle in einem bistabilen Multivibrator zwischen der Betriebsspannung liegenden Widerstände schnell entladen kann, so daß beim erneuten Einschalten der Betriebsspannung erneutThe invention now also relates to a bistable multivibrator, which by the charging current one coupled to the control electrode of one of the two amplifier elements of the multivibrator Capacitor always assumes the same initial state when the operating voltage is switched on, and eliminates the above-described disadvantage of known arrangements in that the with a Allocation to one pole of the operating voltage source connected capacitor with its other Assignment via a diode that is permeable to the discharge current of the capacitor directly with the other pole of the operating voltage source is connected. This makes it possible for a short-term Opening the switching contact that switches off the operating voltage, the capacitor is over this diode as well as all lying in a bistable multivibrator between the operating voltage Resistors can discharge quickly, so that when the operating voltage is switched on again
Anmelder:
Friedrich Merk TelefonbauApplicant:
Friedrich Merk telephone construction
Aktiengesellschaft,
München 9, Warngauer Str. 32Corporation,
Munich 9, Warngauer Str. 32
Dipl.-Ing. Traian Onciul, München,
ist als Erfinder genannt wordenDipl.-Ing. Traian Onciul, Munich,
has been named as the inventor
Ladestrom in den Kondensator fließt, der den gewünschten fest definierten Ausgangszustand des Multivibrators herstellt.Charging current flows into the capacitor, which has the desired fixed output state of the Manufactures multivibrators.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Der bistabile Multivibrator enthält die beiden Transistoren TrI und Tr 2 mit den jeweiligen Kollektorwiderständen RCl und RC 2. In bekannter Weise ist der Kollektor des Transistors TrI über den Basiswiderstand RB 2 mit der Basis des Transistors Tr 2 gekoppelt, während der Kollektor dieses letzteren Transistors über den Basiswiderstand RBl mit der Basis des Transistors TrI verbunden ist. Außerdem ist die Basis des Transistors Tr 2 über den Widerstand R sowie den Kondensator C mit dem Minuspol der Spannungsquelle V verbunden. Die der Basis des Transistors Tr 2 zugekehrte Belegung des Kondensators C steht außerdem über die Diode D unmittelbar mit dem anderen Pol der Spannungsquelle V in Verbindung.An exemplary embodiment of the invention is shown in the drawing. The bistable multivibrator contains the two transistors TrI and Tr 2 with the respective collector resistors RCl and RC 2. In a known manner, the collector of the transistor TrI is coupled to the base of the transistor Tr 2 via the base resistor RB 2 , while the collector of this latter transistor is coupled via the base resistor RBl is connected to the base of the transistor TrI . In addition, the base of the transistor Tr 2 is connected to the negative pole of the voltage source V via the resistor R and the capacitor C. The assignment of the capacitor C facing the base of the transistor Tr 2 is also directly connected to the other pole of the voltage source V via the diode D.
Wird über einen Schalter S die Betriebsspannung eingeschaltet, so wird der Kondensator C über den Widerstands geladen, und es fließt ein negativer Strom in die Basis des Transistors Tr 2, die diesen Transistor öffnet. Dadurch wird der Transistor TrI gesperrt, und über den Kollektorwiderstand RCl dieses Transistors fließt nun weiterhin Strom in die Basis des Transistors Tr 2, und zwar auch dann, wenn der Kondensator C voll geladen ist.If the operating voltage is switched on via a switch S , the capacitor C is charged via the resistor, and a negative current flows into the base of the transistor Tr 2, which opens this transistor. As a result, the transistor TrI is blocked, and current continues to flow into the base of the transistor Tr 2 via the collector resistor RCl of this transistor, even when the capacitor C is fully charged.
Wäre nun die Diode D nicht vorhanden, so würde bei einer etwaigen Prellung des Schalters S beim Öffnen des Schalters S der Kondensator C sich nicht schnell genug entladen können, da die Entladung nur über die Widerstände R, RB 2 und RC1, die in Reihe geschaltet sind, stattfinden kann. Würde alsoNow if the diode D is not present, in a possible contusion of the switch S during opening of the switch S would the capacitor C can not be discharged quickly enough, since the discharge only through the resistors R, RB 2 and RC1 which are connected in series are, can take place. So would
209 580/289209 580/289
der Schalter S unmittelbar nach seiner vorübergehenden Öffnung wieder geschlossen werden, so würde kein Strom in den Kondensator C fließen, da dieser ja noch voll geladen ist, und es entstünde damit ein nicht definierter Ausgangszustand für den bistabilen Multivibrator.If the switch S is closed again immediately after its temporary opening, no current would flow into the capacitor C , since it is still fully charged, and this would result in an undefined initial state for the bistable multivibrator.
Durch die Diode D ist es nun aber möglich, daß sich in diesem Fall der Kondensator C sehr schnell über sämtliche nun parallel wirkenden Widerstände der Multivibratorschaltung entladen kann, so daß beim erneuten Schließen des Schalters S Ladestrom in den Kondensator C fließt, der in der vorbeschriebenen Weise für einen fest definierten Ausgangszustand des bistabilen Multivibrators sorgt.Due to the diode D , however, it is now possible that in this case the capacitor C can discharge very quickly via all the resistors of the multivibrator circuit that are now acting in parallel, so that when the switch S is closed again, charging current flows into the capacitor C, which is described in the above Way ensures a firmly defined initial state of the bistable multivibrator.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM49284A DE1129533B (en) | 1961-06-07 | 1961-06-07 | Bistable multivibrator |
| DEM50131A DE1135041B (en) | 1961-06-07 | 1961-08-25 | Bistable multivibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM49284A DE1129533B (en) | 1961-06-07 | 1961-06-07 | Bistable multivibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1129533B true DE1129533B (en) | 1962-05-17 |
Family
ID=7306468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEM49284A Pending DE1129533B (en) | 1961-06-07 | 1961-06-07 | Bistable multivibrator |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1129533B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1188131B (en) * | 1962-03-15 | 1965-03-04 | Alsthom Cgee | Bistable toggle switch |
| DE1284997B (en) * | 1966-05-31 | 1968-12-12 | Licentia Gmbh | Detention storage |
-
1961
- 1961-06-07 DE DEM49284A patent/DE1129533B/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1188131B (en) * | 1962-03-15 | 1965-03-04 | Alsthom Cgee | Bistable toggle switch |
| DE1284997B (en) * | 1966-05-31 | 1968-12-12 | Licentia Gmbh | Detention storage |
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