DE3642250A1 - Feed current controller for infrared transmission diodes - Google Patents

Feed current controller for infrared transmission diodes

Info

Publication number
DE3642250A1
DE3642250A1 DE19863642250 DE3642250A DE3642250A1 DE 3642250 A1 DE3642250 A1 DE 3642250A1 DE 19863642250 DE19863642250 DE 19863642250 DE 3642250 A DE3642250 A DE 3642250A DE 3642250 A1 DE3642250 A1 DE 3642250A1
Authority
DE
Germany
Prior art keywords
pulse
current
controlled
diodes
transmission diodes
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Withdrawn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
DE19863642250
Other languages
German (de)
Inventor
Hermann Dipl Ing Danzer
Walter Weber
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 Oesterreich
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
Publication of DE3642250A1 publication Critical patent/DE3642250A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/502—LED transmitters

Abstract

Infrared transmission diodes require a feed current supply which is matched to the respective operating conditions. The circuit according to the invention controls the feed current for pulse-controlled transmission diodes in such a way that the transmission diodes (1) are inserted in series with a pulse switch (2) into the discharge current path of a buffer capacitor (5) whose charge current path contains a current regulator (6) which is controlled according to the mark-space ratio of the control pulses which actuate the pulse switch (2). The current regulator (6) is controlled by the output voltage of an amplifier (7) which in turn is supplied with the DC output voltage of a low-pass filter (9, 10) fed by the control pulses via a limiting amplifier (8). <IMAGE>

Description

Die Erfindung betrifft eine Schaltung zur Regelung des Speise­ stromes von impulsgesteuerten Infrarot-Sendedioden.The invention relates to a circuit for regulating the food current of pulse-controlled infrared transmit diodes.

Um Infrarot-Sendedioden mit optimaler Nutzung, d.h. mit maxi­ maler Aussteuerung betreiben zu können, ist es erforderlich, deren Speisestrom auf den größten, gerade noch zulässigen Wert einzustellen. Es war bisher üblich, den Speisestrom mit Hilfe von ohmschen Widerständen zu begrenzen bzw. einzustellen, wo­ mit jedoch keine optimale Bemessung erzielbar ist. Die zu­ lässige Speisestromstärke ist nämlich auch von der Erwärmung der Sendedioden, d.h. von der mittleren Strombelastung abhängig und daher nicht von vornherein auf einen vorgegebenen Wert fest­ legbar. Auch die Unterschiedlichkeit (Exemplarstreuung) der Sendedioden erfordert besondere Berücksichtigung bei der Be­ messung des Speisestromes.To infrared transmit diodes with optimal use, i.e. with maxi To be able to operate the control system, it is necessary their feed current to the largest, just admissible value adjust. It was previously common to use the feed current of ohmic resistances to limit or adjust where however, no optimal dimensioning can be achieved. The too casual feed current is because of the warming of the Transmitter diodes, i.e. dependent on the average current load and therefore not fixed to a predetermined value from the outset layable. Also the diversity (specimen distribution) of the Transmitting diodes require special consideration when loading measurement of the feed current.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Schaltung für impulsgesteuerte Infrarot-Sendedioden zu schaffen, die die optimale Bemessung des jeweiligen Speisestromes erzielt. Er­ findungsgemäß sind die Infrarot-Sendedioden in Serie mit einem Impulsschalter in den Entlade-Strompfad eines Pufferkondensa­ tors geschaltet, dessen Auflade-Strompfad einen in Abhängig­ keit vom Puls-Pulspausenverhältnis der den Impulsschalter be­ tätigenden Steuerimpulse gesteuerten Stromsteller enthält.The invention is therefore based on the object of a circuit for pulse-controlled infrared transmit diodes that create the optimal dimensioning of the respective feed current achieved. He According to the invention, the infrared transmitter diodes are in series with one Pulse switch in the discharge current path of a buffer capacitor tors switched, the charging current path depending on speed of the pulse-to-pause ratio of the pulse switch Acting control impulses controlled current controller contains.

Gemäß einem weiteren Merkmal der Erfindung ist der Stromsteller von der verstärkten Ausgangsgleichspannung eines von den Steuer­ impulsen über einen Begrenzungsverstärker gespeisten Tiefpaß­ filters gesteuert.According to a further feature of the invention, the current regulator from the amplified DC output voltage one from the control impulses fed via a limiting amplifier filters controlled.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Die mit 1 bezeichneten Sendedioden werden mittels eines elektronischen Impulsschalters 2 ein- und ausgeschaltet, dessen Steuerimpulse über eine Steuerleitung 3 dem Steuerein­ gang 4 des Impulsschalters 2 zugeführt werden. Die Sendedioden 1 und der Impulsschalter 2 liegen im Entladestromkreis eines Pufferkondensators 5, dessen Aufladestromkreis ein als Strom­ steller wirkendes elektronisches Steuerelement 6 enthält, das von der Ausgangsspannung eines Verstärkers 7 in dem Sinn ge­ steuert wird, daß dem Pufferkondensator 5 gerade soviel Auf­ ladestrom zugeführt wird, als bei der jeweils herrschenden Impulsdichte an Speisestrom für die Sendedioden 1 verbraucht wird.An embodiment of the invention is shown in the drawing. The transmitter diodes designated 1 are switched by means of an electronic pulse switch 2 and switched off, the control pulses via a control line 3 Steuerein the gear 4 of the pulse switch 2 are fed. The transmit diodes 1 and the pulse switch 2 are in the discharge circuit of a buffer capacitor 5 , the charging circuit of which acts as a current control electronic control element 6 which is controlled by the output voltage of an amplifier 7 in the sense that the buffer capacitor 5 is supplied with just as much charging current than is consumed for the transmitter diodes 1 at the prevailing pulse density of feed current.

Zur Erzielung einer der jeweiligen Impulsdichte entsprechenden Aufladestromstärke des Pufferkondensators 5 ist an die Steuer­ leitung 3 über einen Begrenzungsverstärker 8 ein aus einem Widerstand 9 und einem Kondensator 10 bestehendes Tiefpaßfilter angeschlossen. Das Tiefpaßfilter 9, 10 wird somit von den durch den Begrenzungsverstärker 8 modifizierten Steuerimpulsen für den Impulsschalter 2 gespeist und führt demnach am Kondensator 10 eine von dem Puls-Pulspausenverhältnis bzw. der Impulsdichte der Steuerimpulse abhängige Spannung, die durch den Verstärker 7 verstärkt und dem Stromsteller 6 als Steuerspannung zugeführt wird. Diese bewirkt mit Hilfe des Stromstellers 6 eine definierte Stromeinstellung, die eine Unabhängigkeit von Netz­ spannungsschwankungen, Impulsfolgeänderungen und Temperatur­ änderungen erzielt. Damit wird auch ein sicherer Betrieb der Sendedioden 1 an der Leistungsgrenze ermöglicht. In order to achieve a charge current strength of the buffer capacitor 5 corresponding to the respective pulse density, a low-pass filter consisting of a resistor 9 and a capacitor 10 is connected to the control line 3 via a limiting amplifier 8 . The low-pass filter 9 , 10 is thus fed by the control pulses for the pulse switch 2 modified by the limiting amplifier 8 and accordingly carries a voltage on the capacitor 10 which is dependent on the pulse-to-pulse ratio and the pulse density of the control pulses and which is amplified by the amplifier 7 and the current regulator 6 is supplied as a control voltage. With the help of the current regulator 6, this causes a defined current setting that achieves independence from mains voltage fluctuations, pulse train changes and temperature changes. This also enables safe operation of the transmitter diodes 1 at the power limit.

  • Bezugszeichenliste 1 Sendedioden
    2 Impulsschalter
    3 Steuerleitung
    4 Steuereingang
    5 Pufferkondensator
    6 Stromsteller
    7 Verstärker
    8 Begrenzungsverstärker
    9, 10 Tiefpaßfilter     1 emitter diodes
    2 pulse switches
    3 control line
    4 control input
    5 buffer capacitor
    6 current controllers
    7 amplifiers
    8 limiting amplifiers
    9, 10 low pass filter

Claims (2)

1. Schaltung zur Regelung des Speisestromes von impulsge­ steuerten Infrarot-Sendedioden, dadurch gekennzeichnet, daß die Infrarot-Sendedioden (1) in Serie mit einem Impuls­ schalter (2) in dem Entlade-Strompfad eines Pufferkondensators (5) geschaltet sind, dessen Auflade-Strompfad einen in Ab­ hängigkeit vom Puls-Pulspausenverhältnis der den Impulsschal­ ter (2) betätigenden Steuerimpulse gesteuerten Stromsteller (6) enthält.1. Circuit for regulating the supply current of impulsge controlled infrared transmitter diodes, characterized in that the infrared transmitter diodes ( 1 ) are connected in series with a pulse switch ( 2 ) in the discharge current path of a buffer capacitor ( 5 ), the charging Current path contains a current controller ( 6 ) controlled as a function of the pulse-to-pulse ratio of the pulse switch ( 2 ) actuating control pulses. 2. Schaltung nach Anspruch 1, dadurch gekennzeichnet, daß der Stromsteller (6) von der verstärkten (7) Ausgangsgleich­ spannung eines von den Steuerimpulsen über einen Begrenzungs­ verstärker (8) gespeisten Tiefpaßfilters (9, 10) gesteuert ist.2. Circuit according to claim 1, characterized in that the current controller ( 6 ) is controlled by the amplified ( 7 ) DC output voltage of a low-pass filter ( 9 , 10 ) fed by the control pulses via a limiting amplifier ( 8 ).
DE19863642250 1986-01-17 1986-12-10 Feed current controller for infrared transmission diodes Withdrawn DE3642250A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT10486A AT384131B (en) 1986-01-17 1986-01-17 CIRCUIT FOR CONTROLLING THE CURRENT FLOW OF PULSE-CONTROLLED INFRARED TRANSMITTER DIODES

Publications (1)

Publication Number Publication Date
DE3642250A1 true DE3642250A1 (en) 1987-07-23

Family

ID=3481621

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863642250 Withdrawn DE3642250A1 (en) 1986-01-17 1986-12-10 Feed current controller for infrared transmission diodes

Country Status (2)

Country Link
AT (1) AT384131B (en)
DE (1) DE3642250A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3644086A1 (en) * 1986-12-23 1988-07-07 Sennheiser Electronic Circuit for maintaining the standby facility of an infrared power radiator
DE9017019U1 (en) * 1990-12-17 1991-03-07 Siemens Ag, 8000 Muenchen, De
DE102007011204A1 (en) * 2006-10-17 2008-04-24 Wilo Ag Method for transmitting data and data transmission device for remote control and / or remote access

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3029105A1 (en) * 1979-08-09 1981-02-12 Siemens Ag Electronic and IR optical system for PCM transmission - has modulation stage with pulse shapers controlled by Schmitt trigger circuit and monostable stage
DD159137A1 (en) * 1981-05-25 1983-02-16 Norbert Birkenstock ARRANGEMENT FOR CONTROLLING LUMINESCENCE DIODES IN LIGHT LINE TRANSMISSIONS
GB2148068A (en) * 1983-09-19 1985-05-22 Rca Corp Bias circuit for high speed light emitting diode transmitter
DE2902789C2 (en) * 1978-02-02 1988-04-28 International Standard Electric Corp., New York, N.Y., Us

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135491A1 (en) * 1981-09-08 1983-03-24 Brown, Boveri & Cie Ag, 6800 Mannheim Circuit arrangement for transmitting signals with low power dissipation by means of optocouplers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2902789C2 (en) * 1978-02-02 1988-04-28 International Standard Electric Corp., New York, N.Y., Us
DE3029105A1 (en) * 1979-08-09 1981-02-12 Siemens Ag Electronic and IR optical system for PCM transmission - has modulation stage with pulse shapers controlled by Schmitt trigger circuit and monostable stage
DD159137A1 (en) * 1981-05-25 1983-02-16 Norbert Birkenstock ARRANGEMENT FOR CONTROLLING LUMINESCENCE DIODES IN LIGHT LINE TRANSMISSIONS
GB2148068A (en) * 1983-09-19 1985-05-22 Rca Corp Bias circuit for high speed light emitting diode transmitter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KELAIDITIS, LOOCKE: Verlängerung der Haltbar- keit von Bleibatterien mit Hilfe impulsförmiger Ladung, etz-Archiv Bd.4 (1982) H.5, S.151-155 *
Varta Fachbuchreihe Bd.9: Gasdichte Nickel- Cadmium. Akkumulatoren, Herausg. Varta Batte- rie AG, Hannover 1. Vertrieb VDI-Verlag GmbH, Düsseldorf, 1.Aufl. 1978, ISBN 3-18-419056-0, @ 9.3.3 Kurvenform der Ladeströme (kontinuier- liche und diskontinuierliche Ladeströme), S.205-208 @9.3.6. Anwendung von Pulsladeströmen bei den Ladevorgängen (Pulsarten) S.219-227 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3644086A1 (en) * 1986-12-23 1988-07-07 Sennheiser Electronic Circuit for maintaining the standby facility of an infrared power radiator
DE9017019U1 (en) * 1990-12-17 1991-03-07 Siemens Ag, 8000 Muenchen, De
DE102007011204A1 (en) * 2006-10-17 2008-04-24 Wilo Ag Method for transmitting data and data transmission device for remote control and / or remote access

Also Published As

Publication number Publication date
ATA10486A (en) 1987-02-15
AT384131B (en) 1987-10-12

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Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: SIEMENS AG OESTERREICH, WIEN, AT

8128 New person/name/address of the agent

Representative=s name: LIEBAU, G., DIPL.-ING., PAT.-ANW., 8900 AUGSBURG

8110 Request for examination paragraph 44
8128 New person/name/address of the agent

Representative=s name: FUCHS, F., DR.-ING., PAT.-ANW., 81541 MUENCHEN

8130 Withdrawal