EP2887774B1 - Circuit destiné au fonctionnement d'une unité de lampe pouvant fonctionner sur courant alternatif, ainsi que procédé de fonctionnement d'une telle unité de lampe - Google Patents

Circuit destiné au fonctionnement d'une unité de lampe pouvant fonctionner sur courant alternatif, ainsi que procédé de fonctionnement d'une telle unité de lampe Download PDF

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Publication number
EP2887774B1
EP2887774B1 EP14188589.7A EP14188589A EP2887774B1 EP 2887774 B1 EP2887774 B1 EP 2887774B1 EP 14188589 A EP14188589 A EP 14188589A EP 2887774 B1 EP2887774 B1 EP 2887774B1
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Prior art keywords
comparator
voltage
power amplifier
circuit
dimmer
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EP14188589.7A
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German (de)
English (en)
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EP2887774A1 (fr
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Karl-Heinz Krause
Pierre Marks
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Insta GmbH
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Insta GmbH
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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

Definitions

  • the invention relates to a circuit for operating a lamp unit operable with alternating current. Furthermore, the invention relates to a method for operating such a lamp unit.
  • LED lamps and CFLi lamps compact self-ballasted flourescent lamps. These bulbs have a much higher efficiency than incandescent bulbs. However, the mentioned more efficient bulbs also bring problems. Thus, in most cases it is intended to be able to adjust the brightness of the illuminant, i. to dim this.
  • the light source is driven by a phase angle signal, which is known to be characterized by a steeply rising edge. This can lead to high inrush currents, which in turn leads to switching losses in the control unit (dimmer).
  • a dimmer Since a dimmer is often designed only for limited loads, it is used in particular in more powerful lighting systems in combination with at least one power supplement.
  • Such power supplement includes an output stage which provides an additional power supply to the light source and in turn receives the signal of the dimmer.
  • the majority of the current is provided by the power addition, so that the current provided by the dimmer can be addressed more as a "control current", which serves essentially to control the power addition. In principle, however, this power also contributes to the supply of the light source.
  • both the dimmer and the power supplement are connected to the same supply network.
  • DE 10 2010 000 533 B4 describes a circuit with a controller and a power addition, wherein a current transformer is used in the power addition for detecting the dimmer current.
  • the current transformer is read out by means of a microcontroller, which in turn controls the output stage, to which one or more incandescent lamps are connected. While this prior art circuit works reliably, it can not guarantee a delay-free control of the output stage in all cases. This is primarily due to the limited computing capacity of the microcontroller used and the associated long processing times. Also by the use of the current transformer, the performance of the circuit is limited.
  • WO 2009/120555 discloses a dimmer control circuitry that includes a sensor module, a logic processing module, and a load control signal generator module.
  • the sensor module is configured to detect a line angle of a phase-angle signal, wherein the phase-angle signal is generated by periodically intersecting a periodic voltage signal at the line angle.
  • the logic processing module is in communication with the sensor module and is configured to generate a modulated output signal as a function of the line angle.
  • the load control signal generator module is in communication with the logic processing module and is configured to generate a load control signal as a function of the modulated output signal.
  • the object of the invention is to propose a circuit and a method with which a delay-free control of an additional power by a dimmer in the phase control is possible, especially without having to require a more powerful microcontroller.
  • circuit-related problem is solved by a circuit having the features of claim 1.
  • the method-related object is achieved by a method having the features of claim 8.
  • a circuit for operating a lamp unit operable with alternating current is provided.
  • lamp unit is to be interpreted broadly and refers in the broadest sense an arrangement of one or more lamps, in particular LEDs or CFLis can be used.
  • the circuit comprises a control circuit for receiving the phase gating signal of a dimmer and for driving one to the Lamp unit connected power amplifier according to the received phase gating signal.
  • the task of the control circuit is thus the best possible synchronization between dimmer and power amplifier.
  • a typical dimmer which can be used in conjunction with the circuit according to the invention, is connected to a supply network (for example 230 V) and supplies at its output a phase angle signal. This is typically based on the alternating current supplied by the supply network, wherein, depending on the dimming factor, different portions of the beginning of the respective half-waves are cut away in accordance with the dimming rate.
  • the dimmer input is intended for connection to the dimmer. This can then be used to receive the phase-angle signal of the dimmer.
  • the dimmer input can be given for example by a socket into which a dimmer-side plug is inserted.
  • the connection to the dimmer may be given by a solder joint or the like. It is also conceivable that a single continuous line runs from the dimmer to the resistor, whereby the dimmer input can be seen at any point of the line.
  • the lamp output is provided for connection to the lamp unit. With regard to the physical design of the lamp output, the options shown for the dimmer input apply.
  • the dimmer with one or more power additives can also be implemented as an embedded system.
  • the resistor is connected between the dimmer input and the lamp output.
  • the resistance between the dimmer and the load is switched so that the control current flowing from the dimmer to the lamp unit (or at least a part thereof, if any components are connected in parallel with the resistor) flows through the resistor.
  • the resistor is typically designed as an ohmic resistor (although, as is known, certain inductive and capacitive components of reality can not be ruled out), preferably as a high-impedance resistor.
  • the comparator is set up to compare a measuring voltage applied to the resistor with a comparator voltage.
  • the measuring voltage is the voltage which is applied to the resistor (or drops there) while it is being passed through by the control current.
  • the measurement voltage is thus proportional to the current flowing through the resistor between the dimmer and the lamp unit and to the value of the resistor.
  • a comparator has two inputs. While the measuring voltage is applied to one input of the comparator, the comparator voltage to which the measuring voltage is compared is applied to the other input.
  • the comparator voltage is set to a value that is close to zero or, in any case, considerably smaller than an expected peak value of the measuring voltage.
  • the output of the comparator is provided for connection to the output stage.
  • the output voltage of the comparator assumes one of two extreme values (logic "1” and "0"), depending on whether the measuring voltage or the comparator voltage is greater.
  • An output of the output stage is here connected to the lamp unit and supplies this after activation of the power amplifier with power.
  • the voltage applied to the resistor voltage may be subject to certain fluctuations, which could lead to a faulty control of the power amplifier. Due to the described fluctuations of the measuring voltage, it could happen that the falling below the threshold voltage, the output stage is already deactivated before the actual end of a half-wave.
  • a control unit according to the invention is provided which, for example, can be realized by a microcontroller. After the output stage has been activated by the comparator, which the control unit can ascertain, for example, by tapping the output voltage of the comparator, the control unit maintains the activation of the output stage independently of the applied measuring voltage.
  • the power amplifier remains forcibly activated by the control unit.
  • This forced activation maintains the control unit up to a release time which is before or at the expected zero crossing of the measurement voltage.
  • a zero crossing of the measuring voltage corresponds to the end of a half-wave and thus to the point at which the control of the output stage is to take place again on the basis of the described voltage comparison by the comparator.
  • the release time can be determined in different ways. These algorithms are well known.
  • the control unit is configured to maintain the activation by changing the comparator voltage so that a comparison with the measurement voltage results in the comparator holding the final stage activated.
  • the input of the comparator for the comparator voltage is connected to the control unit.
  • the control unit may set the comparator voltage to a negative one Set the value so that even with unexpected fluctuations of the measuring voltage in the area of the zero point, the measuring voltage is still recognized as the larger one.
  • a comparison of the two voltages always leads to an activation of the power amplifier.
  • control unit is adapted to maintain the activation by directly controlling the output stage. This can happen, for example, in that the control unit interrupts the connection between the output of the comparator and the output stage and instead feeds its own control signals via a corresponding connection to the output stage.
  • the release date can be set in different ways.
  • One possibility for this is, for example, that the control unit for determining the release time is set up from a measurement of the phase-angle signal.
  • the phase-angle signal may in this case be e.g. be controlled via the measuring voltage applied to the resistor.
  • the control unit is connected in a similar way to the resistor between the dimmer input and the lamp output.
  • control unit can here also include the observations from past half-waves, which can be based in particular on voltage measurements.
  • the information can be evaluated alone or in combination with current measured values by means of suitable algorithms in order to determine an expected value for the next zero crossing.
  • the comparator with provided a hysteresis Such a comparator, which is also referred to as Schmitt trigger, changes the voltage at its output only when the difference of the two input voltages exceeds a certain threshold. If, for example, the measuring voltage exceeds a certain value relative to the comparator voltage, the output voltage changes its level (for example, from “0" to "1"); If the measuring voltage then drops again, the level does not change immediately, but only with a certain delay.
  • the purpose of this embodiment is to avoid swinging the control signal of the dimmer.
  • the comparator and the control unit in the context of the present invention represent functionally different units. Physically, however, these can advantageously be designed as a single component. In this case, the comparator and the control unit form parts of an integrated circuit. Since the control unit usually has a much higher complexity than the comparator, one could also say that the comparator is integrated in the control unit.
  • the resistor used advantageously has a relatively high value, so that even at low currents a sufficiently large measuring voltage is present, which can be easily evaluated by the comparator.
  • means for limiting the measuring voltage are provided according to an embodiment.
  • such means comprise at least one diode.
  • diodes can be connected in parallel to the resistor. From a certain voltage these diodes act as a kind of bypass for the resistor, which limits the power loss.
  • the measuring voltage applied to the resistor is no longer continuously proportional to the control current. A proportionality is given for small voltages, for large values limits Forward voltage of the diodes the measuring voltage. However, there is also an increase in the voltage during phase control, which is sufficient for activating the output stage by the comparator.
  • the circuit according to the invention can be supplemented by an output stage, which is connected to the control by the control circuit with this.
  • the entire circuit including the power amplifier can be installed within a housing as an additional power, which can be integrated into existing systems with a dimmer and a lamp unit.
  • circuit is supplemented when used as intended by a dimmer connected to the dimmer input and connected to the lamp output and the power amplifier lamp unit.
  • the circuit comprises a plurality of control circuits and power amplifiers, wherein in each case a control circuit is associated with an output stage.
  • the respective control circuits may be connected in series with respect to the output from the dimmer control current, so that the lamp output of a first control circuit is not directly connected to the lamp unit, but to the dimmer input of a second control circuit and from there via the resistor and lamp output finally to the lamp unit , Accordingly, in this embodiment, the dimmer input of the second control circuit is not directly connected to the dimmer but indirectly via the first control circuit.
  • control unit keeps the output stage activated by changing the reference voltage in such a way that a comparison with the measurement voltage results in the comparator holding the output stage activated.
  • control unit keeps the output stage activated by directly controlling the output stage.
  • the control unit preferably determines the release time from a measurement of the phase-angle signal. Alternatively or additionally, it is preferred that the control unit determines the release time with the aid of previously stored information about the phase gating signal.
  • FIG. 1 shows an embodiment of a circuit 1 according to the invention for operating a lamp unit 50.
  • the lamp unit 50 the here simplified as a single light source is shown, may well include, for example, several tens or hundreds of LEDs.
  • the power of the lamp unit 50 is to be controlled by means of a dimmer 40 which is connected to phase 60 and neutral 61 of a supply network. At a dimmer output 41, the dimmer 40 provides a phase gating signal.
  • the circuit 1 further comprises two power supplements 10, 30, in which the phase-angle signal is fed successively and which are connected in series between dimmer output 41 and lamp unit 50 in this regard. Since the two power supplements 10, 30 are designed the same here, only the first power supplement 10 will be described in detail below. These statements apply equally to the performance supplement 30.
  • the power addition 10 has a network connection 14 for the phase 60 of the supply network and a supply terminal 15 for the lamp unit 50 to which a phase control signal is to be provided, the power amplified and synchronized as possible to that at the dimmer output 41 should.
  • the basic structure of the power addition 10 is shown in the block diagram in FIG. 2 seen.
  • the power supplement 10 has a dimmer input 11 which is connected to the dimmer output 41. Between this dimmer input 11 and a lamp output 12, a resistor 13 is connected. The lamp output 12 is in turn connected to the lamp unit 50 via the second power addition 30. Therefore, the control current flows between the dimmer output 41 and the lamp unit 50 through the resistor 13, where a measurement voltage drops there.
  • the measuring voltage is applied to a first input 17 of a comparator 16 provided with a hysteresis, whose second input 18 is connected to a microcontroller 20.
  • the dimmer input 11, the lamp output 12, the resistor 13, the comparator 16 and the microcontroller 20 form the essential components of a control circuit 2.
  • a comparator output 19 is for controlling an output stage 21 with a control input provided there 22 connected.
  • the output stage is further connected to the mains terminal 14, via which it is supplied with voltage, as well as to the supply terminal 15, where it is to provide the power-enhanced phase gating signal.
  • the microcontroller 20 which is also connected via not shown connections to the supply network, the second input 18 of the comparator 16 with a comparator voltage, which is just above 0 V. Since initially virtually no current flows between the dimmer input 11 and the lamp output 12, no measuring voltage is present at the resistor 13. The difference between the measuring voltage and comparator voltage is below a threshold given by the hysteresis, which is why a voltage - corresponding to logic "0" - is applied to the comparator output 19, by which the output stage 21 is not activated. With the phase angle of the current flowing through the resistor 13 increases significantly and thus the voltage applied to the resistor 13 measurement voltage.
  • the microcontroller 20 picks up the voltage applied to the comparator output 19 and thus determines the activation of the output stage 21. It maintains this activation by significantly reducing the comparator voltage applied to the second input 18 in this embodiment, so that even with fluctuations in the measuring voltage, this is always always greater than the comparator voltage.
  • the comparator voltage can be set to a value that is below the measurement voltage that occurs when no current flows.
  • the microcontroller 20 via connections also not shown the course of the measurement voltage and extrapolated by means of an internally predetermined algorithm the probable next zero crossing.
  • the microcontroller 20 raises the comparator voltage again to the initial value (slightly above 0 V), whereby the control of the output stage 21 is again based effectively on an evaluation of the measurement voltage at the resistor 13.
  • FIG. 3 An alternative embodiment of an additional power 10a is shown in FIG. 3 shown. This can alternatively take place in the FIG. 2 shown power supplement 10 can be used. Its structure corresponds essentially to that of performance supplement 10, which is why only the differences are to be explained below.
  • the comparator 16a which picks up the measuring voltage applied to the resistor 13, integrated in a microcontroller 20a.
  • the first phase of the control of the output stage 21 is the same here as in the reference to FIG FIG. 2 described embodiment, wherein the comparator 16a is applied to the control input 22 via a comparator output 19a.
  • the microcontroller 20a detects the activation of the output stage 21, it interrupts the connection between the comparator output 19a and the control input 22 of the power amplifier and provides a not shown here circuit at the control input 22 a - logic "1" corresponding - ready, through which the power amplifier 21 remains activated. After the release time, the microcontroller 20a restores the connection between the comparator output 19a and the control input 22.
  • control circuit 2a shown in the figure with respect to the control circuit 2 is that it comprises, in addition to the resistor 13, two diodes 23, 24 which are connected in anti-parallel to each other and parallel to the resistor 13. As a result, care is taken that the voltage applied to the resistor 13 and the associated power loss is not too large. This circuit used for limiting the power loss can equally be realized in the control circuit 2.
  • two power supplements 10, 30 are used, each of which comprises a control circuit 2, 2a according to the invention and an output stage 21. It is understood that, depending on the power consumption of the lamp unit 50, a single power addition 10, 30 could be used in conjunction with the dimmer 40.

Claims (10)

  1. Circuit pour faire fonctionner une unité de lampe (50) fonctionnant avec un courant alternatif, comprenant un circuit de commande (2, 2a) pour recevoir un signal à coupure de phase ascendante d'un variateur (40) d'un amplificteur de puissances (21), une sortie (15) de l'amplificteur de puissances (21) étant reliée à l'unité de lampe (50) pour commander l'unité de lampe (50) conformément au signal à coupure de phase ascendante, ledit circuit de commande (2, 2a) comprenant les éléments suivants:
    - une entrée de variateur (11) pour raccordement au variateur (40), une sortie de lampe (12) pour raccordement à l'unité de lampe (50) ainsi qu'une résistance (13) intercalée entre l'entrée de variateur (1) et la sortie de lampe (12),
    - un comparateur (16, 16a) pour comparer une tension de mesure connectée à la résistance (13) avec une tension de comparateur, une sortie (19, 19a) du comparateur (16, 16a) étant reliée à l'amplificateur de puissances (21) pour activer l'amplificateur de puissances (21) en fonction du résultat de la comparaison,
    caractérisé en ce que le circuit de commande (2, 2a) en plus
    - comprend une unité de commande (20, 20a) qui est agencée pour détecter, en prélevant la tension de sortie du comparateur, si l'amplificateur de puissances (21) a été activé par le comparateur (16, 16a) et pour maintenir l'activation de l'amplificateur de puissances (21) indépendamment de la tension de mesure jusqu'à un temps de validation déterminé sur la base du signal à coupure de phase ascendante, ce temps de validation étant avant un passage par zéro attendu de la tension de mesure.
  2. Circuit selon la revendication 1, caractérisé en ce que l'unité de commande (20) est agencée pour modifier la tension de comparateur de telle facon que l'activation est maintenue, de sorte qu'une comparaison avec la tension de mesure fasse que le comparateur (16) maintien active l'amplificateur de puissances (21).
  3. Circuit selon l'une des revendications précédentes, caractérisé en ce que l'unité de commande (20, 20a) est agencée pour déterminer le temps de validation à partir d'une mesure du signal à coupure de phase ascendante.
  4. Circuit selon l'une des revendications précédentes, caractérisé en ce que le comparateur (16, 16a) est doté d'une hystérésis.
  5. Circuit selon l'une des revendications précédentes, caractérisé en ce que le comparateur (16a) et l'unité de commande (20a) sont configurés comme parties d'un circuit intégré.
  6. Circuit selon l'une des revendications précédentes, caractérisé en ce que des moyens (23, 24) sont prévus pour limiter la tension de mesure, lesquels moyens (23, 24) comprennent de préférence au moins une diode.
  7. Procédé pour faire fonctionner une unité de lampe (50) fonctionnant avec un courant alternatif, comportant un amplificateur de puissances (21) relié à l'unité de lampe (50) et une résistance (13) d'un circuit de commande (2, 2a), qui est reliée entre une entrée de variateur (11) du circuit de commande (2, 2a) et l'unité de lampe (50), le procédé ayant les étapes:
    - Recevoir un signal à coupure de phase ascendante du variateur (40),
    - Comparer une tension de mesure chutant à la résistance (13) avec une tension de comparateur à l'aide d'un comparateur (16, 16a),
    - Activer l'amplificateur de puissances (21) en fonction de la comparaison,
    - A l'aide d'une unité de commande (20, 20a) après l'amplificateur de puissances (21) a été activé: détecter l'activation de l'amplificateur de puissances (21) par prise de la tension de sortie du comparateur (16, 16a) du circuit de commande (2, 2a),
    - Maintenir l'activation de l'amplificateur de puissances (21 ) indépendamment de la tension de mesure jusqu'à un temps de validation déterminé sur la base du signal à coupure de phase ascendante, ce temps de validation étant avant un passage par zéro attendu de la tension de mesure.
  8. Procédé selon la revendication 7, caractérisé en ce que l'étape de maintenir l'activation comprend l'étape: modifier la tension de comparateur, de sorte que l'amplificateur de puissances (21) reste active.
  9. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce que le temps de validation est déterminé par mesure du signal à coupure de phase ascendante.
  10. Procédé selon l'une des revendications 7 à 9, caractérisé en ce que le temps de validation est déterminé via le signal à coupure de phase ascendante par des informations stockés préalablement.
EP14188589.7A 2013-12-23 2014-10-13 Circuit destiné au fonctionnement d'une unité de lampe pouvant fonctionner sur courant alternatif, ainsi que procédé de fonctionnement d'une telle unité de lampe Active EP2887774B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013114761.5A DE102013114761B3 (de) 2013-12-23 2013-12-23 Schaltung zum Betreiben einer mit Wechselstrom betreibbaren Lampeneinheit sowie Verfahren zum Betreiben einer solchen Lampeneinheit

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EP2887774A1 EP2887774A1 (fr) 2015-06-24
EP2887774B1 true EP2887774B1 (fr) 2019-10-23

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DE102016209278B3 (de) * 2016-05-30 2017-08-10 Siemens Schweiz Ag Dimmersystem

Citations (2)

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Publication number Priority date Publication date Assignee Title
US20120119669A1 (en) * 2010-11-16 2012-05-17 Melanson John L Trailing Edge Dimmer Compatibility With Dimmer High Resistance Prediction
US20130154495A1 (en) * 2011-12-14 2013-06-20 Cirrus Logic, Inc. Adaptive Current Control Timing and Responsive Current Control for Interfacing with a Dimmer

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
EP1478213A4 (fr) * 2002-02-20 2005-03-09 Matsushita Electric Ind Co Ltd Dispositif d'eclairage de lampe a decharge sans electrode, lampe fluorescente sans electrode de type ampoule, et dispositif d'eclairage de lampe a decharge
US8102167B2 (en) * 2008-03-25 2012-01-24 Microsemi Corporation Phase-cut dimming circuit
DE102010000533B4 (de) 2010-02-24 2011-12-01 Insta Elektro Gmbh Steuergerät zum Übertragen einer Steuerinformation an eine Lampeneinheit sowie Verfahren zum Betreiben eines solchen Steuergerätes
US20130175931A1 (en) * 2012-01-05 2013-07-11 Laurence P. Sadwick Triac Dimming Control System

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120119669A1 (en) * 2010-11-16 2012-05-17 Melanson John L Trailing Edge Dimmer Compatibility With Dimmer High Resistance Prediction
US20130154495A1 (en) * 2011-12-14 2013-06-20 Cirrus Logic, Inc. Adaptive Current Control Timing and Responsive Current Control for Interfacing with a Dimmer

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DE102013114761B3 (de) 2014-12-24

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