EP0346405B1 - Circuit arrangement for controlling the brightness of a lamp - Google Patents
Circuit arrangement for controlling the brightness of a lamp Download PDFInfo
- Publication number
- EP0346405B1 EP0346405B1 EP88909090A EP88909090A EP0346405B1 EP 0346405 B1 EP0346405 B1 EP 0346405B1 EP 88909090 A EP88909090 A EP 88909090A EP 88909090 A EP88909090 A EP 88909090A EP 0346405 B1 EP0346405 B1 EP 0346405B1
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- EP
- European Patent Office
- Prior art keywords
- lamp
- voltage
- control unit
- sensor
- circuit
- 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.)
- Expired - Lifetime
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- 239000004020 conductor Substances 0.000 claims description 15
- 230000007935 neutral effect Effects 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000010355 oscillation Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/04—Controlling
- H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
- H05B39/083—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity
- H05B39/085—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity by touch control
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- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S323/00—Electricity: power supply or regulation systems
- Y10S323/904—Touch systems
Definitions
- the invention relates to a circuit arrangement for controlling the brightness of a lamp according to the preamble of claim 1.
- This known circuit arrangement is not provided and also not suitable for a low-voltage lamp, for example a halogen lamp, since a corresponding low-voltage source would be required for its operation.
- a circuit arrangement would require a large outlay and a large volume.
- a starter and control circuit for an electric discharge lamp is known from EP-A142063.
- the circuit comprises a ballast capacitor connected in series with the discharge lamp, a preheating ballast capacitor connected in parallel with the discharge lamp, and a power supply unit for supplying electrical power to the ballast capacitors, which is operated by an oscillator circuit via a transformer .
- the oscillator circuit is fed by a mains voltage rectified by means of two rectifiers.
- EP-A-202579 relates to a power supply circuit for a special type of load which has a reverse blocking characteristic, as is the case with a magnetron.
- the power supply circuit of the magnetron comprises a transformer, the secondary side of which is connected in parallel to the magnetron and a parallel capacitor.
- the invention has for its object to develop a generic circuit arrangement for switching on and off and controlling the brightness of a lamp so that it can be used to control low-voltage lamps.
- an AC mains voltage N of, for example, 220 V is fed via a fuse SI to a rectifier GL, which is designed in particular as a full-wave rectifier.
- the mains AC voltage N is supplied via a phase connection PH and a neutral connection NU.
- the rectifier GL rectifies the mains AC voltage N and generates a first DC voltage G1, which is supplied to a transformer circuit having a primary part P and a secondary part S, which is designed as a half-bridge converter.
- the primary part P has a primary winding PW which is magnetically coupled to a secondary winding SW of the secondary part S.
- a low-voltage lamp L in particular a halogen lamp, is connected to the secondary winding SW. This lamp L lights up as soon as a corresponding voltage is induced in the secondary winding SW and a current I flows through the lamp L.
- the primary part P is controlled by a control unit ST, to which a sensor SE is connected.
- a control unit ST is generally known and is commercially available, for example, under the designation S 576A (Siemens).
- the sensor SE is preferably connected to the secondary part S and attached to the lamp.
- a small current S1 flows from, for example, approximately 200 ⁇ A of rectifier GL via resistors R3, R2, R1, the lamp L and the operator BP.
- a voltage drop across resistor R2 is evaluated by a comparator in control unit ST. This generates a brightness signal H with which the primary part P is switched on and controlled. If the operator BP touches the sensor only briefly, the lamp L is switched on.
- the instantaneous value of the brightness signal H is changed by the control unit ST and thus the brightness of the lamp L is changed via the primary part P in accordance with a phase control, so that the brightness of the lamp L is determined by the duration of the touch.
- the lamp L can be switched off again by briefly touching the sensor SE again.
- the control unit ST is supplied with voltage by a second DC voltage G2 of, for example, 15 V, which is generated from the pulsating DC voltage G1, which is the Control unit ST is supplied via the resistor R3 connected between points A and B.
- the sensor SE is controlled via the further resistor R2 connected between the point B and a point C and the resistor R1 connected between the point C and a point D.
- the control unit ST is connected on the one hand to a ground point MP, to which the rectifier GL and the primary part P are also connected, and on the other hand the control unit ST is also connected to a protective conductor SL of the mains AC voltage N or to the neutral conductor NU.
- the protective conductor SL or the neutral conductor NU serve as the reference voltage for the synchronization of the control unit ST through the zero crossings of the AC line voltage N.
- synchronizing via the protective conductor SL it is not important how the mains plug is inserted.
- it is necessary to have a protective conductor SL which is not the case in all countries.
- the neutral conductor NU it is important that the mains plug is inserted in the correct direction, so that it is ensured that the control unit ST is connected to the neutral conductor NU and not to the phase connection PH.
- circuit arrangement Further details of the circuit arrangement are described below together with the circuit diagram shown in FIG. 2 and the time diagrams shown in FIG. 3, in which the time t in the abscissa direction and the instantaneous values of signals at different points in FIG. 2 in the ordinate direction Circuit arrangement are shown.
- the rectifier GL generates the pulsating direct voltage G1 from the mains alternating voltage N supplied via the fuse SI, which has a peak value at point A of approximately 310 V, based on the ground point MP.
- This pulsating DC voltage G1 at point A is shown at the top in FIG. 3.
- This DC voltage G1 ' contains only one half-wave of the AC mains voltage N.
- the DC voltage G1 is on the one hand to the primary part P and on the other hand via the resistor R3 to a Zener diode Z, which generates the DC voltage G2 at point B as the operating voltage for the control unit ST.
- a smoothing capacitor C1 is connected in parallel with the Zener diode Z. According to FIG. 3, the DC voltage G2 at point B is a smoothed DC voltage of, for example, 15 V.
- the transformer circuit is designed in a known manner as a half-bridge converter and generates the high-frequency oscillation HF with a frequency of, for example, 40 kHz in the primary part P, and the high-frequency oscillation is modulated by the pulsating DC voltage G1.
- This vibration HF is shown in FIG. 2. It generates in the secondary winding SW at point D a high-frequency oscillation S2 ′′′ shown in FIGS. 2 and 3 with an amplitude of, for example, + - 17 V, based on a secondary ground point SM.
- This vibration S2 ′′′ causes a current I through the lamp L so that it lights up according to the desired brightness.
- Point D has the voltage curve S2 ⁇ , likewise shown in FIG. 3, with an amplitude of approximately -150 V, based on the DC voltage G2 at point B.
- the control unit ST With the occurrence of the voltage S1 ⁇ , the control unit ST outputs a signal to a transistor T, which controls it in a conductive manner and generates the brightness signal H in order to switch on the electronic transformer, which is represented schematically by a switch in the primary part P.
- the high-frequency oscillation HS is thus generated in the primary part P and the current I flows for the operation of the lamp L in the secondary part S.
- the protective conductor SL or the neutral conductor NU is used, as shown in dashed lines, the AC line voltage N.
- the protective conductor SL or the neutral conductor NU is connected to the control unit ST via a resistor R4.
- the connection point of the resistor R4 to the control unit ST is connected to the DC voltage G2 via a capacitor C2.
- the control unit ST is connected to the DC voltage G2 via a capacitor C3 which eliminates high-frequency interference. This capacitor C3 defines the internal time base of the control unit ST.
- the lamp L burns with a predetermined brightness. If the operator BP now touches the sensor SE for a long time, the instantaneous value of the brightness signal H changes and the brightness of the lamp L is thus controlled in accordance with a phase control. Lamp L is switched off by briefly touching it again. Then the transformer T is blocked and the transformer circuit is switched off again.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Schaltungsanordnung zum Steuern der Helligkeit einer Lampe gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a circuit arrangement for controlling the brightness of a lamp according to the preamble of claim 1.
Es ist bereits bekannt, die Hellingkeit einer Lampe in einer an einer Netzwechselspannung angeschlossenen Leuchte durch das Berühren eines als Sensor dienenden elektrisch leitenden Teils der Leuchte oder der Lampe zu steuern (DE-Zeitschrift "Funk-Technik", Band 37, Heft 5, 1982, Seite 192). Bei einem kurzen ersten Berühren des Sensors wird die Lampe eingeschaltet. Durch ein längeres Berühren des Sensors kann die Helligkeit der Lampe im Bedarfsfall verändert werden. Das Ausschalten der Lampe erfolgt durch ein weiteres kurzes Berühren des Sensors. Diese bekannte Schaltungsanordnung weist eine Lampe auf, die über einen Triac an einer Netzwechselspannung angeschlossen ist. Eine Steuereinheit, an der der Sensor angeschlossen ist, gibt ein Helligkeitssignal an der Triac ab. Mit dem Helligkeitssignal wird der Triac eingeschaltet, ausgeschaltet oder entsprechend der gewünschten Helligkeit der Lampe leitend gesteuert. Die Helligkeitssteuerung der Lampe erfolgt dabei entsprechend einer Phasenschnittsteuerung, die durch den Momentanwert des Helligkeitssignals gesteuert wird.It is already known to control the brightness of a lamp in a lamp connected to an AC voltage by touching an electrically conductive part of the lamp or lamp serving as a sensor (DE magazine "Funk-Technik", volume 37, volume 5, 1982 , Page 192). The lamp is switched on when you briefly touch the sensor for the first time. A longer touch on the sensor can change the brightness of the lamp if necessary. The lamp is switched off by briefly touching the sensor again. This known circuit arrangement has a lamp which is connected to a mains AC voltage via a triac. A control unit, to which the sensor is connected, emits a brightness signal on the triac. With the brightness signal, the triac is switched on, switched off or controlled according to the desired brightness of the lamp. The brightness control of the lamp is carried out in accordance with a phase cut control, which is controlled by the instantaneous value of the brightness signal.
Für eine Niedervoltlampe, beispielsweise eine Halogenlampe, ist diese bekannte Schaltungsanordnung nicht vorgesehen und auch nicht geeignet, da zu ihrem Betrieb eine entsprechende Niederspannungsquelle erforderlich wäre. Insbesondere bei Verwendung eines üblichen Transformators für die Erzeugung der entsprechenden Niederspannungsquelle würde eine derartige Schaltungsanordnung einen großen Aufwand und ein großes Volumen erfordern.This known circuit arrangement is not provided and also not suitable for a low-voltage lamp, for example a halogen lamp, since a corresponding low-voltage source would be required for its operation. In particular when using a conventional transformer for the generation of the corresponding low-voltage source, such a circuit arrangement would require a large outlay and a large volume.
Aus der EP-A142063 ist eine Starter- und Steuerschaltung für eine elektrische Entladungslampe bekannt. Die Schaltung umfaßt einen Ballast-Kondensator in Serienschaltung zu der Entladungslampe, einen Vorheiz-Ballast-Kondensator, der parallel zu der Entladungslampe geschaltet ist, und eine Leistungsversorgungseinheit zum Zuführen elektrischer Leistung zu den Ballast-Kondensatoren, die von einer Oszillatorschaltung über einen Transformator betrieben wird. Die Oszillatorschaltung wird von einer mittels zwei Gleichrichtern gleichgerichteten Netzspannung gespeist.A starter and control circuit for an electric discharge lamp is known from EP-A142063. The circuit comprises a ballast capacitor connected in series with the discharge lamp, a preheating ballast capacitor connected in parallel with the discharge lamp, and a power supply unit for supplying electrical power to the ballast capacitors, which is operated by an oscillator circuit via a transformer . The oscillator circuit is fed by a mains voltage rectified by means of two rectifiers.
Die EP-A-202579 betrifft eine Leistungsversorgungsschaltung für eine spezielle Art einer Last, die eine rückwärts blockierende Charakteristik hat, wie dies bei einem Magnetron der Fall ist. Die Leistungsversorgungsschaltung des Magnetrons umfaßt einen Transformator, dessen Sekundärseite in Parallelschaltung an dem Magnetron sowie einem Parallel-Kondensator liegt.EP-A-202579 relates to a power supply circuit for a special type of load which has a reverse blocking characteristic, as is the case with a magnetron. The power supply circuit of the magnetron comprises a transformer, the secondary side of which is connected in parallel to the magnetron and a parallel capacitor.
Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Schaltungsanordnung zum Ein- und Ausschalten und Steuern der Helligkeit einer Lampe so weiterzubilden, daß mit ihr Niedervolt-Lampen angesteuert werden können.The invention has for its object to develop a generic circuit arrangement for switching on and off and controlling the brightness of a lamp so that it can be used to control low-voltage lamps.
Diese Aufgabe wird durch eine Schaltungsanordnung gemäß Patentanspruch 1 gelöst.This object is achieved by a circuit arrangement according to claim 1.
Ein Ausführungsbeispiel der Schaltungsanordnung gemäß der Erfindung wird im folgenden anhand von Zeichnungen näher erläutert. Es zeigen:
- Fig. 1
- ein Blockschaltbild der Schaltungsanordnung;
- Fig. 2
- ein vereinfachtes Schaltbild der Schaltungsanordnung; und
- Fig. 3
- Zeitdiagramme von Signalen an verschiedenen Punkten der Schaltungsanordnung.
- Fig. 1
- a block diagram of the circuit arrangement;
- Fig. 2
- a simplified circuit diagram of the circuit arrangement; and
- Fig. 3
- Time diagrams of signals at various points in the circuit arrangement.
Bei der in Fig. 1 dargestellten Schaltungsanordnung wird eine Netzwechselspannung N von beispielsweise 220 V über eine Sicherung SI einem Gleichrichter GL zugeführt, der insbesondere als ein Doppelweggleichrichter ausgebildet ist. Die Netzwechselspannung N wird über einen Phasenanschluß PH und einen Null-Leiteranschluß NU zugeführt. Der Gleichrichter GL richtet die Netzwechselspannung N gleich und erzeugt eine erste Gleichspannung G1, die einer einen Primärteil P und einen Sekundärteil S aufweisende Transformatorschaltung zugeführt wird, die als ein Halbbrückenwandler ausgebildet ist. Der Primärteil P weist eine Primärwicklung PW auf die mit einer Sekundärwicklung SW des Sekundärteils S magnetisch gekoppelt ist. An der Sekundärwicklung SW ist eine Niedervoltlampe L, insbesondere eine Halogenlampe, angeschlossen. Diese Lampe L leuchtet, sobald in der Sekundärwicklung SW eine entsprechende Spannung induziert wird und durch die Lampe L ein Strom I fließt.In the circuit arrangement shown in FIG. 1, an AC mains voltage N of, for example, 220 V is fed via a fuse SI to a rectifier GL, which is designed in particular as a full-wave rectifier. The mains AC voltage N is supplied via a phase connection PH and a neutral connection NU. The rectifier GL rectifies the mains AC voltage N and generates a first DC voltage G1, which is supplied to a transformer circuit having a primary part P and a secondary part S, which is designed as a half-bridge converter. The primary part P has a primary winding PW which is magnetically coupled to a secondary winding SW of the secondary part S. A low-voltage lamp L, in particular a halogen lamp, is connected to the secondary winding SW. This lamp L lights up as soon as a corresponding voltage is induced in the secondary winding SW and a current I flows through the lamp L.
Die Steuerung des Primärteils P erfolgt durch eine Steuereinheit ST, an der ein Sensor SE angeschlossen ist. Eine derartige Steuereinheit ST ist allgemein bekannt und beispielsweise unter der Bezeichnung S 576A (Siemens) im Handel erhältlich. Der Sensor SE ist vorzugsweise mit dem Sekundärteil S verbunden und an der Leuchte angebracht. Beim Berühren des Sensors SE durch eine Bedienperson BP fließt ein kleiner Strom S1 von der beispielsweise ca. 200 µA von Gleichrichter GL über Widerstände R3, R2, R1, die Lampe L und die Bedienperson BP. Ein Spannungsabfall am Widerstand R2 wird durch einen Komparator in der Steuereinheit ST ausgewertet. Diese erzeugt ein Helligkeitssignal H, mit dem der Primärteil P eingeschaltet und gesteuert wird. Wenn die Bedienperson BP den Sensor nur kurz berührt, wird die Lampe L eingeschaltet. Bei längerem Berühren wird der Momentanwert des Helligkeitssignals H durch die Steuereinheit ST verändert und damit wird über den Primärteil P die Helligkeit der Lampe L entsprechend einer Phasenanschnittsteuerung verändert, so daß die Helligkeit der Lampe L durch die Dauer der Berührung festgelegt wird. Durch ein weiteres kurzes Berühren des Sensors SE kann die Lampe L wieder ausgeschaltet werden.The primary part P is controlled by a control unit ST, to which a sensor SE is connected. Such a control unit ST is generally known and is commercially available, for example, under the designation S 576A (Siemens). The sensor SE is preferably connected to the secondary part S and attached to the lamp. When an operator BP touches the sensor SE, a small current S1 flows from, for example, approximately 200 μA of rectifier GL via resistors R3, R2, R1, the lamp L and the operator BP. A voltage drop across resistor R2 is evaluated by a comparator in control unit ST. This generates a brightness signal H with which the primary part P is switched on and controlled. If the operator BP touches the sensor only briefly, the lamp L is switched on. When touched for a longer time, the instantaneous value of the brightness signal H is changed by the control unit ST and thus the brightness of the lamp L is changed via the primary part P in accordance with a phase control, so that the brightness of the lamp L is determined by the duration of the touch. The lamp L can be switched off again by briefly touching the sensor SE again.
Die Spannungsversorgung der Steuereinheit ST erfolgt durch eine zweite Gleichspannung G2 von beispielsweise 15 V, die aus der pulsierenden Gleichspannung G1 erzeugt wird, die der Steuereinheit ST über den zwischen Punkten A und B angeschlossenen Widerstand R3 zugeführt wird. Über den zwischen dem Punkt B und einem Punkt C angeschlossenen weiteren Widerstand R2 und den zwischen dem Punkt C und einem Punkt D angeschlossenen Widerstand R1 wird der Sensor SE angesteuert. Die Steuereinheit ST ist einerseits mit einem Massepunkt MP verbunden, an dem auch der Gleichrichter GL und der Primärteil P angeschlossen sind, und andererseits ist die Steuereinheit ST auch an einem Schutzleiter SL der Netzwechselspannung N angeschlossen oder mit den Nulleiter NU verbunden. Der Schutzleiter SL oder der Nulleiter NU dienen als Bezugsspannung für die Synchronisation der Steuereinheit ST durch die Nulldurchgänge der Netzwechselspannung N. Bei einer Synchronisation über den Schutzleiter SL kommt es nicht darauf an, wie der Netzstecker eingesteckt ist. Es ist jedoch erforderlich, daß ein Schutzleiter SL vorhanden ist, was nicht in allen Ländern gegeben ist. Bei einer Synchronisation über den Nulleiter NU ist es jedoch wichtig, daß der Netzstecker in der richtigen Richtung eingesteckt ist, so daß sichergestellt ist, daß die Steuereinheit ST mit dem Nulleiter NU und nicht mit dem Phasenanschluß PH verbunden ist.The control unit ST is supplied with voltage by a second DC voltage G2 of, for example, 15 V, which is generated from the pulsating DC voltage G1, which is the Control unit ST is supplied via the resistor R3 connected between points A and B. The sensor SE is controlled via the further resistor R2 connected between the point B and a point C and the resistor R1 connected between the point C and a point D. The control unit ST is connected on the one hand to a ground point MP, to which the rectifier GL and the primary part P are also connected, and on the other hand the control unit ST is also connected to a protective conductor SL of the mains AC voltage N or to the neutral conductor NU. The protective conductor SL or the neutral conductor NU serve as the reference voltage for the synchronization of the control unit ST through the zero crossings of the AC line voltage N. When synchronizing via the protective conductor SL, it is not important how the mains plug is inserted. However, it is necessary to have a protective conductor SL, which is not the case in all countries. In the case of synchronization via the neutral conductor NU, however, it is important that the mains plug is inserted in the correct direction, so that it is ensured that the control unit ST is connected to the neutral conductor NU and not to the phase connection PH.
Weitere Einzelheiten der Schaltungsanordnung werden im folgenden zusammen mit dem in Fig. 2 dargestellten Schaltbild und den in Fig. 3 dargestellten Zeitdiagrammen beschrieben, bei denen in Abszissenrichtung jeweils die Zeit t und in Ordinatenrichtung die Momentanwerte von Signalen an verschiedenen Punkten der in Fig. 2 dargestellten Schaltungsanordnung gezeigt sind.Further details of the circuit arrangement are described below together with the circuit diagram shown in FIG. 2 and the time diagrams shown in FIG. 3, in which the time t in the abscissa direction and the instantaneous values of signals at different points in FIG. 2 in the ordinate direction Circuit arrangement are shown.
Bei der in Fig. 2 dargestellten Schaltungsanordnung erzeugt der Gleichrichter GL aus der über die Sicherung SI zugeführten Netzwechselspannung N die pulsierende Gleichspannung G1, die am Punkt A einen Spitzenwert von etwa 310 V, bezogen auf den Massepunkt MP, aufweist. Diese pulsierende Gleichspannung G1 an dem Punkt A ist in Fig. 3 oben dargestellt. Bezogen auf Erde oder auf den Schutzleiter SL ergibt sich die pulsierende Gleichspannung G1′, wie sie ebenfalls in Fig. 3 dargestellt ist. Diese Gleichspannung G1′ beinhaltet nur jeweils eine Halbwelle der Netzwechselspannung N. Die Gleichspannung G1 liegt einerseits an dem Primärteil P und andererseits über den Widerstand R3 an einer Zenerdiode Z an, die die Gleichspannung G2 am Punkt B als Betriebsspannung für die Steuereinheit ST erzeugt. Parallel zu der Zenerdiode Z ist ein Glättungskondensator C1 geschaltet. Die Gleichspannung G2 am Punkt B ist entsprechend Fig. 3, bezogen auf den Massenpunkt MP, eine geglättete Gleichspannung von beispielsweise 15 V.In the circuit arrangement shown in FIG. 2, the rectifier GL generates the pulsating direct voltage G1 from the mains alternating voltage N supplied via the fuse SI, which has a peak value at point A of approximately 310 V, based on the ground point MP. This pulsating DC voltage G1 at point A is shown at the top in FIG. 3. Relative to earth or to the protective conductor SL, the pulsating result DC voltage G1 ', as is also shown in Fig. 3. This DC voltage G1 'contains only one half-wave of the AC mains voltage N. The DC voltage G1 is on the one hand to the primary part P and on the other hand via the resistor R3 to a Zener diode Z, which generates the DC voltage G2 at point B as the operating voltage for the control unit ST. A smoothing capacitor C1 is connected in parallel with the Zener diode Z. According to FIG. 3, the DC voltage G2 at point B is a smoothed DC voltage of, for example, 15 V.
Die Transformatorschaltung ist in bekannter Weise als ein Halbbrückenwandler ausgebildet und erzeugt im Primärteil P die hochfrequente Schwingung HF mit einer Frequenz von beispielsweise 40 kHz, und die hochfrequente Schwingung ist durch die pulsierende Gleichspannung G1 moduliert. Diese Schwingung HF ist in Fig. 2 dargestellt. Sie erzeugt in der Sekundärwicklung SW am Punkt D eine in Fig. 2 und Fig. 3 dargestellte hochfrequente Schwingung S2‴ mit einer Amplitude von beispielsweise +- 17 V, bezogen auf einen sekundären Massepunkt SM. Diese Schwingung S2‴ bewirkt einen Strom I durch die Lampe L, so daß diese entsprechend der gewünschten Helligkeit leuchtet.The transformer circuit is designed in a known manner as a half-bridge converter and generates the high-frequency oscillation HF with a frequency of, for example, 40 kHz in the primary part P, and the high-frequency oscillation is modulated by the pulsating DC voltage G1. This vibration HF is shown in FIG. 2. It generates in the secondary winding SW at point D a high-frequency oscillation S2 ‴ shown in FIGS. 2 and 3 with an amplitude of, for example, + - 17 V, based on a secondary ground point SM. This vibration S2 ‴ causes a current I through the lamp L so that it lights up according to the desired brightness.
Das Einschalten der Lampe L erfolgt durch Berühren des Sensors SE durch die Bedienperson BP. Der Punkt D weist dann den in Fig. 3 ebenfalls dargestellten Spannungsverlauf S2˝ mit einer Amplitude von etwa -150 V, bezogen auf die Gleichspannung G2 am Punkt B, auf. Über den Spannungsteiler aus den Widerständen R1 und R2 wird am Punkt C eine Spannung S1˝ mit einer Amplitude von etsa -15V, bezogen auf die Gleichspannung G2, erzeugt.The lamp L is switched on by touching the sensor SE by the operator BP. Point D then has the voltage curve S2˝, likewise shown in FIG. 3, with an amplitude of approximately -150 V, based on the DC voltage G2 at point B. A voltage S1˝ with an amplitude of etsa -15V, based on the DC voltage G2, is generated at point C via the voltage divider consisting of resistors R1 and R2.
Mit dem Auftreten der Spannung S1˝ gibt die Steuereinheit ST an einen Transistor T ein Signal ab, das diesen leitend steuert und das Helligkeitssignal H erzeugt, um den elektronischen Transformator einzuschalten, was schematisch durch einen Schalter im Primärteil P dargestellt ist. Damit wird im Primärteil P die hochfrequente Schwingung HS erzeugt und im Sekundärteil S fließt der Strom I für den Betrieb der Lampe L.With the occurrence of the voltage S1˝, the control unit ST outputs a signal to a transistor T, which controls it in a conductive manner and generates the brightness signal H in order to switch on the electronic transformer, which is represented schematically by a switch in the primary part P. The high-frequency oscillation HS is thus generated in the primary part P and the current I flows for the operation of the lamp L in the secondary part S.
Zur Gewinnung des Synchronisationssignals für die Steuereinheit ST aus den Nulldurchgängen dient der Schutzleiter SL oder der Nulleiter NU, wie es gestrichelt dargestellt ist der Netzwechselspannung N. Der Schutzleiter SL bzw. der Nulleiter NU ist über einen Widerstand R4 an der Steuereinheit ST angeschlossen. Außerdem liegt der Anschlußpunkt des Widerstands R4 an der Steuereinheit ST über einen Kondensator C2 an der Gleichspannung G2 an. Weiterhin ist die Steuereinheit ST über einen hochfrequenten Störungen beseitigenden Kondensator C3 an der Gleichspannung G2 angeschlossen. Dieser Kondensator C3 legt die interne Zeitbasis der Steuereinheit ST fest.To obtain the synchronization signal for the control unit ST from the zero crossings, the protective conductor SL or the neutral conductor NU is used, as shown in dashed lines, the AC line voltage N. The protective conductor SL or the neutral conductor NU is connected to the control unit ST via a resistor R4. In addition, the connection point of the resistor R4 to the control unit ST is connected to the DC voltage G2 via a capacitor C2. Furthermore, the control unit ST is connected to the DC voltage G2 via a capacitor C3 which eliminates high-frequency interference. This capacitor C3 defines the internal time base of the control unit ST.
Nach dem Einschalten brennt die Lampe L mit einer vorgegebenen Helligkeit. Falls nun die Bedienperson BP den Sensor SE längere Zeit berührt, verändert sich der Momentanwert des Helligkeitssignals H und damit wird entsprechend einer Phasenanschnittsteuerung die Helligkeit der Lampe L gesteuert. Das Ausschalten der Lampe L erfolgt durch ein erneutes kurzes Berühren. Dann wird der Transformator T gesperrt und die Transformatorschaltung wieder ausgeschaltet.After switching on, the lamp L burns with a predetermined brightness. If the operator BP now touches the sensor SE for a long time, the instantaneous value of the brightness signal H changes and the brightness of the lamp L is thus controlled in accordance with a phase control. Lamp L is switched off by briefly touching it again. Then the transformer T is blocked and the transformer circuit is switched off again.
Claims (3)
- Circuit arrangement for controlling the brightness of a lamp (L) in a light connected to a mains alternating voltage, in which circuit both the switching-on of the lamp as well as the control of the brightness are effected by touching a sensor (SE), and in which there is provided a control unit (ST) to which the sensor is connected and which produces a control signal (H) for switching the lamp on and off as well as for brightness control of said lamp in a phase control mode,
characterized by- a rectifier (GL) which has applied thereto the mains alternating voltage on its input side and which has one of its output terminals connected to a reference voltage terminal (MP) of the control unit (ST);- a high-frequency half-bridge transformer circuit whose primary section (PW) is adapted to be connected, on the one hand, to the other output terminal (A) of the rectifier (GL) and, on the other hand, to the reference voltage terminal (MP) via a switch means (P) controlled by the control signal (H) from said control unit (ST) so that the high-frequency oscillation produced in the primary section (PW) of the high-frequency half-bridge transformer circuit is modulated according to the rectified mains voltage, the secondary section (SW) of said high frequency half-bridge transformer circuit being connected to the lamp (L) which is designed as a low-voltage lamp (L);- a direct voltage generation circuit (R3, C1, Z) for generating at a connection point (B) a direct voltage related to the potential of the reference voltage terminal (MP); and- the sensor (SE) being, on the one hand, connected to a pole of the low-voltage lamp (L) and being, on the other hand, operatively connected to the connection point (B) of the direct voltage generation circuit (R3, C1, Z) as well as to a control input (C) of the control unit (ST) so as to cause a change of potential at the control input (C) of the control unit (ST) when an operating person touches said sensor (SE). - Circuit arrangement according to claim 1, characterized in
that the sensor (SE) is connected to the control input (C) of the control unit (ST) via a first high-ohmic resistor (R1), which is, in turn, connected to the connection point (B) of the direct voltage generation circuit (R3, C1, Z) via a second high-ohmic resistor (R2). - Circuit arrangement according to claim 1 or 2, characterized in
that the reference voltage terminal (MP) of the circuit arrangement has relative to the protective conductor or the neutral conductor a voltage corresponding to one of the two half waves of the mains alternating voltage (N).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88909090T ATE92705T1 (en) | 1987-10-26 | 1988-10-25 | SWITCHING ARRANGEMENT FOR CONTROLLING THE BRIGHTNESS OF A LAMP. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873736222 DE3736222A1 (en) | 1987-10-26 | 1987-10-26 | CIRCUIT ARRANGEMENT FOR CONTROLLING THE BRIGHTNESS OF A LAMP |
| DE3736222 | 1987-10-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0346405A1 EP0346405A1 (en) | 1989-12-20 |
| EP0346405B1 true EP0346405B1 (en) | 1993-08-04 |
Family
ID=6339104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88909090A Expired - Lifetime EP0346405B1 (en) | 1987-10-26 | 1988-10-25 | Circuit arrangement for controlling the brightness of a lamp |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4988924A (en) |
| EP (1) | EP0346405B1 (en) |
| JP (1) | JPH02501966A (en) |
| AT (1) | ATE92705T1 (en) |
| DE (2) | DE3736222A1 (en) |
| WO (1) | WO1989004110A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3930618C1 (en) * | 1989-09-13 | 1991-01-31 | Maurer, Ingo, 8000 Muenchen, De | |
| US5663633A (en) * | 1994-07-15 | 1997-09-02 | Holmes Products Corp. | Touch control fan and method |
| DE19500615B4 (en) * | 1995-01-11 | 2006-10-19 | Tridonicatco Gmbh & Co. Kg | Brightness control circuit for incandescent lamps |
| DE19628891C1 (en) * | 1996-07-17 | 1997-07-17 | Hermann Kovacs | Touch-sensitive sensor operated lamp brightness unit power supply control |
| US5783875A (en) * | 1997-02-11 | 1998-07-21 | The Lamson & Sessions Co. | Touch sensor circuit |
| FR2778305A1 (en) * | 1998-04-30 | 1999-11-05 | Jean Jacques Hirsch | ELECTRIC SWITCHES |
| SE518662C2 (en) * | 2001-04-27 | 2002-11-05 | Lars Aake Wern | Electric switch comprising a capacitive sensor circuit |
| AU2003282463A1 (en) * | 2002-10-17 | 2004-05-04 | Mallinckrodt Inc. | Polymer pharmaceutical pig and associated method of use and associated method of production |
| DE102010004199B4 (en) * | 2010-01-08 | 2014-02-06 | Austriamicrosystems Ag | Circuit arrangement and method for driving an electrical load |
| DE102012204284A1 (en) | 2012-03-19 | 2013-09-19 | Occhio GmbH | Lamp head, has coating- or grating structured capacitive sensor providing capacitive sensor signal and arranged between outer and inner surfaces of cover element or spaced from inner surface of cover element |
| CN103384428B (en) * | 2012-05-03 | 2016-09-07 | 海洋王（东莞）照明科技有限公司 | Lamp driving circuit and lamp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0142063A1 (en) * | 1983-10-19 | 1985-05-22 | Hitachi Lighting, Ltd. | Lighting apparatus for an electric discharge lamp |
| EP0202579A1 (en) * | 1985-05-14 | 1986-11-26 | Matsushita Electric Industrial Co., Ltd. | Power feed apparatus for load having reverse blocking characteristics |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2647266A1 (en) * | 1976-10-20 | 1978-04-27 | Bengel & Bros Bebro | AC power supply circuit for halogen lamp LV photo enlarger - has timing circuit controlling thyristor bridge that feeds voltage stabiliser |
| US4096414A (en) * | 1977-05-24 | 1978-06-20 | Cbs Inc. | Dimmer control circuit |
| US4168453A (en) * | 1977-12-28 | 1979-09-18 | Datapower, Inc. | Variable intensity control apparatus for operating a gas discharge lamp |
| US4250432A (en) * | 1979-04-16 | 1981-02-10 | Beatrice Foods Co. | Touch dimmer circuit |
| GB2077011B (en) * | 1980-05-27 | 1983-03-09 | Yeldham Albert James | A bedroom light control device |
| US4379254A (en) * | 1981-03-23 | 1983-04-05 | Andrew L. D'Orio | Dimmer circuit for fluorescent lamp |
| JPS58157083A (en) * | 1982-03-15 | 1983-09-19 | 松下電工株式会社 | emergency light circuit |
| US4663570A (en) * | 1984-08-17 | 1987-05-05 | Lutron Electronics Co., Inc. | High frequency gas discharge lamp dimming ballast |
| JPS61285698A (en) * | 1985-06-12 | 1986-12-16 | 岩崎電気株式会社 | Dimmer device |
| DE3635109A1 (en) * | 1986-10-15 | 1988-04-21 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR THE OPERATION OF LOW-VOLTAGE HALOGEN BULBS |
-
1987
- 1987-10-26 DE DE19873736222 patent/DE3736222A1/en active Granted
-
1988
- 1988-10-25 WO PCT/EP1988/000956 patent/WO1989004110A1/en not_active Ceased
- 1988-10-25 EP EP88909090A patent/EP0346405B1/en not_active Expired - Lifetime
- 1988-10-25 JP JP63508412A patent/JPH02501966A/en active Pending
- 1988-10-25 DE DE8888909090T patent/DE3882979D1/en not_active Expired - Fee Related
- 1988-10-25 US US07/363,888 patent/US4988924A/en not_active Expired - Lifetime
- 1988-10-25 AT AT88909090T patent/ATE92705T1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0142063A1 (en) * | 1983-10-19 | 1985-05-22 | Hitachi Lighting, Ltd. | Lighting apparatus for an electric discharge lamp |
| EP0202579A1 (en) * | 1985-05-14 | 1986-11-26 | Matsushita Electric Industrial Co., Ltd. | Power feed apparatus for load having reverse blocking characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3736222A1 (en) | 1989-05-03 |
| US4988924A (en) | 1991-01-29 |
| ATE92705T1 (en) | 1993-08-15 |
| JPH02501966A (en) | 1990-06-28 |
| EP0346405A1 (en) | 1989-12-20 |
| DE3882979D1 (en) | 1993-09-09 |
| WO1989004110A1 (en) | 1989-05-05 |
| DE3736222C2 (en) | 1990-08-23 |
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