DE3624586A1 - Constant current source - Google Patents

Constant current source

Info

Publication number
DE3624586A1
DE3624586A1 DE19863624586 DE3624586A DE3624586A1 DE 3624586 A1 DE3624586 A1 DE 3624586A1 DE 19863624586 DE19863624586 DE 19863624586 DE 3624586 A DE3624586 A DE 3624586A DE 3624586 A1 DE3624586 A1 DE 3624586A1
Authority
DE
Germany
Prior art keywords
transistor
emitter
base
constant current
resistor
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.)
Withdrawn
Application number
DE19863624586
Other languages
German (de)
Inventor
Juergen Ing Grad Bliesner
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE19863624586 priority Critical patent/DE3624586A1/en
Publication of DE3624586A1 publication Critical patent/DE3624586A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/22—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations wherein the transistors are of the bipolar type only

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

The invention relates to a constant current source having a first transistor (1), the emitter of which is connected via a resistor (2) to the input terminal (3) and the collector of which is connected to the output terminal (4). The emitter of the first transistor (1) is connected to the base of a second transistor (6) which is used as a regulator. The emitter of the second transistor is connected to the input terminal (3) and its collector is connected to the base of the first transistor (1). The base of the first transistor (1) is preceded by a third transistor (9) via a control resistor (8). <IMAGE>

Description

Die Erfindung betrifft eine Konstantstromquelle mit einem ersten Transistor, dessen Emitter über einen Wider­ stand an der Eingangsklemme und dessen Kollektor an der Ausgangsklemme liegt, wobei an dem Emitter des ersten Transistors die Basis eines zweiten Transistors ange­ schlossen ist, dessen Emitter mit der Eingangsklemme und dessen Kollektor mit der Basis des ersten Transistors verbunden ist.The invention relates to a constant current source a first transistor, whose emitter via a counter stood on the input terminal and its collector on the Output terminal is located on the emitter of the first Transistor is the base of a second transistor is closed, its emitter with the input terminal and its collector with the base of the first transistor connected is.

Bisher wurde in der Regel ein im Arbeitsbereich nähe­ rungsweise konstanter Strom durch eine aufwendige Rege­ lung mittels Operationsverstärker erreicht.So far, one was usually in the work area approximately constant current through an elaborate rain achieved by means of an operational amplifier.

Es besteht die Aufgabe, eine Konstantstromquelle der eingangs genannten Art mit einfachen Mitteln zu reali­ sieren.The task is to provide a constant current source Reali at the beginning with simple means sieren.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß der Basis des ersten Transistors über einen Ansteuer­ widerstand ein dritter Transistor vorgeschaltet ist.According to the invention, this object is achieved in that the base of the first transistor via a drive resistance a third transistor is connected upstream.

Bei der erfindungsgemäßen Vorrichtung regelt der zweite Transistor die Spannung am Emitterwiderstand und damit den Strom I, in dem er die Spannung am Widerstand mit seiner Basis-Emitterspannung vergleicht. Der über den Ansteuerwiderstand abfließende Strom wird von dem zwei­ ten Transistor so geregelt, daß der Basisstrom des er­ sten Transistors beeinflußt wird. Dadurch wird der erste Transistor in den aktiven Bereich gesteuert und dadurch der Strom I geregelt. Über den dritten Transistor ist schließlich ein schnelles Ein- und Ausschalten der Kon­ stantstromquelle möglich.In the device according to the invention, the second transistor regulates the voltage across the emitter resistor and thus the current I by comparing the voltage across the resistor with its base-emitter voltage. The current flowing through the drive resistor is regulated by the two-th transistor so that the base current of the most transistor is influenced. As a result, the first transistor is controlled into the active region and the current I is thereby regulated. Finally, the constant current source can be switched on and off quickly via the third transistor.

Vorzugsweise ist die Emitter-Kollektorstrecke des zwei­ ten Transistors mit einem Widerstand überbrückt.The emitter collector path is preferably the two bridged transistor with a resistor.

Dieser Widerstand nützt die Spannung über den Emitter­ widerstand zum schnellen Abschalten der Konstantstrom­ quelle aus.This resistance uses the voltage across the emitter resistance to quickly turn off the constant current source.

Im folgenden wird die erfindungsgemäße Vorrichtung bei­ spielhaft anhand der Figur näher erläutert.The device according to the invention is described below explained in more detail by means of the figure.

In der FIG ist der Emitter eines ersten Transistors 1, der als Leistungsstellglied dient, über einen Emitter­ widerstand 2 mit der Eingangsklemme 3 verbunden. Der Kollektor des Transistors 1 liegt an der Ausgangsklemme 4, die an einen angedeuteten Lastwiderstand 5 ange­ schlossen ist. Dieser Lastwiderstand 5, der mit kon­ stantem Strom arbeiten muß, kann beispielsweise ein Zeitglied sein oder der Ausgangsstrom kann zur Ansteue­ rung von Leistungstransistoren verwendet werden.In the FIG, the emitter of a first transistor 1 , which serves as a power actuator, is connected via an emitter resistor 2 to the input terminal 3 . The collector of transistor 1 is connected to the output terminal 4 , which is connected to an indicated load resistor 5 . This load resistor 5 , which has to work with constant current, can be, for example, a timer or the output current can be used to control power transistors.

Mit dem Emitter des Transistors 1 ist die Basis eines als Regler dienenden zweiten Transistors 6 verbunden, dessen Emitter mit der Eingangsklemme 3 und dessen Kollek­ tor mit der Basis des ersten Transistors 1 verbunden ist. Der Emitter-Kollektorstrecke des Transistors 6 ist ein Widerstand 7 als Basisableitwiderstand parallel geschal­ tet. Die Basis des Transistors 1 wird schließlich über einen Ansteuerwiderstand 8 ausgesteuert, dem ein dritter Transistor 9 nachgeschaltet ist.With the emitter of transistor 1 , the base of a second transistor 6 serving as a regulator is connected, the emitter of which is connected to the input terminal 3 and the collector of which is connected to the base of the first transistor 1 . The emitter-collector path of the transistor 6 , a resistor 7 is switched as a base leakage resistor in parallel. The base of transistor 1 is finally driven via a control resistor 8 , which is followed by a third transistor 9 .

Claims (2)

1. Konstantstromquelle mit einem ersten Transistor, des­ sen Emitter über einen Widerstand an der Eingangsklemme und dessen Kollektor an der Ausgangsklemme liegt, wobei an dem Emitter des ersten Transistors die Basis eines zweiten Transistors angeschlossen ist, dessen Emitter mit der Eingangsklemme und dessen Kollektor mit der Basis des ersten Transistors verbunden ist, dadurch gekennzeichnet, daß der Basis des ersten Transistors (1) über einen Ansteuerwiderstand (8) ein dritter Transistor (9) vorgeschaltet ist.1. constant current source with a first transistor, the sen emitter via a resistor at the input terminal and its collector at the output terminal, wherein the base of a second transistor is connected to the emitter of the first transistor, the emitter with the input terminal and the collector with the Base of the first transistor is connected, characterized in that a third transistor ( 9 ) is connected upstream of the base of the first transistor ( 1 ) via a control resistor ( 8 ). 2. Konstantstromquelle nach Anspruch 1, dadurch gekennzeichnet, daß die Emitter-Kollektor­ strecke des zweiten Transistors (6) mit einem Widerstand (7) überbrückt ist.2. Constant current source according to claim 1, characterized in that the emitter-collector path of the second transistor ( 6 ) is bridged with a resistor ( 7 ).
DE19863624586 1986-07-21 1986-07-21 Constant current source Withdrawn DE3624586A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863624586 DE3624586A1 (en) 1986-07-21 1986-07-21 Constant current source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863624586 DE3624586A1 (en) 1986-07-21 1986-07-21 Constant current source

Publications (1)

Publication Number Publication Date
DE3624586A1 true DE3624586A1 (en) 1988-01-28

Family

ID=6305620

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863624586 Withdrawn DE3624586A1 (en) 1986-07-21 1986-07-21 Constant current source

Country Status (1)

Country Link
DE (1) DE3624586A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1336911A1 (en) * 2002-02-08 2003-08-20 Tyco Electronics AMP GmbH Circuit arrangement for controlling a constant current through a load

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH354125A (en) * 1957-01-23 1961-05-15 Standard Telephon & Radio Ag Circuit arrangement for regulating the current on lines in telecommunications, preferably telephone systems with key dialing
DE2014351A1 (en) * 1970-03-25 1971-11-11 Siemens Ag Circuit arrangement for regulating a current
DE2350718B2 (en) * 1973-10-10 1976-10-14 Deutsche Itt Industries Gmbh, 7800 Freiburg MONOLITHICALLY INTEGRATED TWO-POLE CIRCUIT, CONSTANT CURRENT CONSUMPTION

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH354125A (en) * 1957-01-23 1961-05-15 Standard Telephon & Radio Ag Circuit arrangement for regulating the current on lines in telecommunications, preferably telephone systems with key dialing
DE2014351A1 (en) * 1970-03-25 1971-11-11 Siemens Ag Circuit arrangement for regulating a current
DE2350718B2 (en) * 1973-10-10 1976-10-14 Deutsche Itt Industries Gmbh, 7800 Freiburg MONOLITHICALLY INTEGRATED TWO-POLE CIRCUIT, CONSTANT CURRENT CONSUMPTION

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1336911A1 (en) * 2002-02-08 2003-08-20 Tyco Electronics AMP GmbH Circuit arrangement for controlling a constant current through a load
DE10205194A1 (en) * 2002-02-08 2003-08-28 Tyco Electronics Amp Gmbh Circuit arrangement for controlling a constant current through a load
US6816002B2 (en) 2002-02-08 2004-11-09 Tyco Electronics Amp Gmbh Circuit arrangement for controlling a constant current through a load

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