EP2608636A1 - Procédé et appareil de gestion d'alimentation fournie à partir d'une alimentation CA à découpe de phase - Google Patents

Procédé et appareil de gestion d'alimentation fournie à partir d'une alimentation CA à découpe de phase Download PDF

Info

Publication number
EP2608636A1
EP2608636A1 EP11194264.5A EP11194264A EP2608636A1 EP 2608636 A1 EP2608636 A1 EP 2608636A1 EP 11194264 A EP11194264 A EP 11194264A EP 2608636 A1 EP2608636 A1 EP 2608636A1
Authority
EP
European Patent Office
Prior art keywords
supply
interval
load
dimmer
phase
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Withdrawn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
EP11194264.5A
Other languages
German (de)
English (en)
Inventor
Alexander Pawellek
Juergen Stahl
Jens GOETTLE
Thomas Duerbaum
Anton Blom
Frans Pansier
Hans Halberstadt
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.)
Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
NXP BV
Original Assignee
Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
NXP BV
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 Friedrich Alexander Univeritaet Erlangen Nuernberg FAU, NXP BV filed Critical Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
Priority to EP11194264.5A priority Critical patent/EP2608636A1/fr
Publication of EP2608636A1 publication Critical patent/EP2608636A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]

Definitions

  • This invention relates to method of controlling loads under mains-dimmers, and to power convertors configured to operate according to such methods.
  • Mains-dimmers are widely used for lighting applications.
  • the most common type of mains dimmer is the phase-cut dimmer, which relies on the generally sinusoidal cyclic characteristic of the mains voltage signal, and disables the supply during a part of the mains phase.
  • phase-cut dimmers operate effectively for incandescent lighting.
  • CFL compact fluorescent lighting
  • LED light emitting diode
  • Phase-cut dimmers are either "leading-edge” or “trailing edge", depending on which part of the mains half-cycle is cut.
  • Leading-edge dimmers are typically implemented using a triac as the switching device, and trailing edge dimmers using a transistor such as a MOS transistor.
  • a firing network inside the dimmer senses the mains voltage and fires at the appropriate phase angle of the mains voltage. At the firing moment, the switching device is triggered. Provided that sufficient current remains flowing in the triac (in the case of a leading edge dimmer) after it is fired and it starts conducting, it stays in a conducting mode until the next zero-crossing of the mains current.
  • Such leading-edge dimmers therefore need a minimum current to be drawn in order to prevent them turning off too early. This current may be referred to as the holding current
  • the current drawn by the lighting application may become so low that it is not able to keep the dimmer conducting once the triac has fired.
  • the load is configured to draw an additional current, which may be 10 - 50 mA for a typical domestic wall-mounted dimmer, by means of a bleed resistor in order to keep the dimmer conducting. This current is not useful for providing luminosity and thus significantly decreases the system's efficiency especially at low lighting levels.
  • bleeder resistors are accentuated at very deep dimming levels where only very low currents are drawn; they are even more significant for smart lighting applications when in standby mode, at which times it is important to keep the power drawn to a minimum in order to preserve the time for which the device can remain in standby.
  • a method of managing the supply of power to a load from a phase-cut AC supply over a plurality of AC supply half-cycle periods comprising: drawing energy from the phase-cut AC supply during at least one part of a first interval, the first interval being at least part of at least one AC supply half-cycle; storing some of the energy, and supplying the some of the energy to the load during a second interval being at least one subsequent AC supply half-cycle; wherein the first and second intervals total to the plurality of AC supply half-cycle periods.
  • the power drawn from the AC supply, during the at least one part of a first interval may thus be higher than it would be absent the second interval during which power is not drawn.
  • the load may be disconnected from the supply during the second interval. Without restricting the inventing thereto, it is noted that in applications with high impedance loads, such as CFL or LED lighting application, it may be possible to reduce or even eliminate the losses associated with bleeders thereby.
  • the term 'plurality' includes a whole number, that is to say 'a plurality' includes 'an integral plurality'; however, it also includes a non-integral number, that is to say, plurality includes for instance two-and-a-half.
  • the method further comprises setting a duration of at least one of the first interval and the second interval such that the power drawn during the at least part of the first interval is sufficient to enable triggering of the AC phase-cutting device.
  • the AC phase-cutting device is the device which cuts the phase of the AC supply, and may, for instance, be a triac or a transistor, and may cut the leading edge or the trailing edge of the AC-phase.
  • the supply is switched on or triggered at the leading edge; in the case of a trailing edge phase-cut supply, the supply is triggered or switched on at the start of the phase. It may be possible to reduce or even eliminate the need for a bleeder, which might otherwise be required to ensure correct triggering and/or operation of the phase-cutting switch.
  • the first interval is an AC supply half-cycle and the at least part of a first interval comprises a single window.
  • the first interval is a plurality of AC supply half-cycles, and the at least part of a first interval comprises a single window in each of the plurality of AC supply half-cycles.
  • the method may further comprise detecting a phase of the AC supply, and synchronising the or each window to the phase of the AC supply.
  • detecting a phase of the AC supply comprises detecting a zero-crossing of the mains, and the method further comprises predicting a further zero-crossing based on the detected zero-crossing.
  • the first and second intervals total to an odd-number of AC supply half-cycles.
  • Generation of harmonics of the mains frequency are generally undesirable, and in some environments may be limited by regulations.
  • even harmonics (with a frequency twice, four times, six times, etc. the fundamental) are often undesirable
  • the at least one part of a first interval is one part of a first interval and is shorter than a conduction angle of the phase-cut AC supply. Such embodiments may reduce or avoid the requirement for or the size of, a bleeder circuit, even when the energy which is required to be drawn from the AC supply is very low.
  • a controller for supplying power to a load from a phase-cut AC supply over an integral plurality of AC supply half-cycle periods, the controller being connectable to an energy store, the controller being configured to: draw energy from the phase-cut AC supply during at least one part of a first interval, the first interval being at least part of at least one AC supply half-cycle, store some of the energy in the energy store and supply the some of the energy to the load during a second interval being at least one subsequent AC supply half-cycle, wherein the first and second interval total to the integral plurality of AC supply half-cycle periods.
  • the energy store is a capacitor.
  • the controller further comprises a zero-crossing detection unit. It may further comprise a zero-crossing prediction unit.
  • a lighting control circuit comprising a switched mode power converter and a controller as just described
  • a lighting system comprising a lighting unit, the lighting system further comprising a lighting control circuit or a controller as just described.
  • figure 1 shows, plotted against time t, at 100, energy drawn from a generally sinusoidal mains power supply, which is input into a phase-cut dimmer.
  • the phase-cut dimmer is a leading-edge dimmer.
  • the dimmer is set to be heavily dimmed, that is to say, the dimmer switches on only towards the end of each mains half-cycle. For the first part 106 of the mains half-cycle, the dimmer is switched off, and does not supply any energy and so no energy is transferred; during the last part108 of the mains half-cycle, the dimmer is switched on and can transfer energy to a load.
  • This figure also shows, at 110, the energy which is delivered to a load.
  • energy is continuously supplied to the load, in this example; however, in other embodiments, such as that shown schematically at 114, energy need not be supplied continuously: it may only be required intermittently.
  • the power required by the load is very low, then the energy required by the load over the mains half-cycle is also very low: thus, unless the conversion means itself consumes significant energy, the energy required to be supplied from the mains during the dimmer-on part 108 is also low, and thus the power during the dimmer-on part 108 may also be low.
  • the quantum of energy drawn from the mains during each dimmer-on part 104 must be sufficient to supply energy to the load for three half-cycles (since 2 dimmer-on parts together supply the energy for both those two half-cycles and the following four half-cycles).
  • the power drawn from the mains during each dimmer-on part 104 is thus three times as large as it would have been if the dimmer were made to trigger for every half-cycle.
  • the relative lengths of the first interval 120 and the second interval 130 may be chosen so as to provide that the dimmer has to draw sufficient power during each dimmer-on part such that correct triggering operation occurs. This will in general depend on the particular application, and may or may not be known before the system is installed. It will, generally, depend on the characteristics of the specific type of dimmer used, and the level of dimming applied.
  • FIG. 2 shows, at 210, a first set of three half-cycles 220 comprising a first interval, during which the dimmer operates in a conventional manner, followed by a set of four half-cycles at 230 comprising a second interval during which the dimmer remains off. At the end of the set of four half-cycles, a further set of three half-cycles, during which the dimmer operates, commences.
  • the group 240 of 7 half-cycles forms a "sub-cycle", which term will be considered in more detail below.
  • the conduction angle 250 of the dimmer may generally be less than the complete half-cycle 220.
  • the dimmer only conducts for a part of each of the first three half-cycles.
  • power is only drawn from the mains over three parts of a first interval, which first interval comprises the first three mains half-cycles.
  • the dimmer is dimmed less than in figure 1 ; in both cases a leading-edge dimmer is shown, although the invention is not limited thereto.
  • the power is supplied to the load during at least one part of the second interval, which second interval is the set of four half-cycles 230.
  • FIG. 3 shows a block diagram of a system configured to manage supply to a load, according to embodiments of the invention.
  • the figure shows a dimmer 302 which is connected to a dimmer load 304.
  • the dimmer load comprises a load 306 which consumes a certain power, for example a CFL (compact fluorescent lamp) driver stage.
  • the dimmer load 304 further comprises a switchable converter 308.
  • the switchable converter 308 draws energy from the dimmer and, neglecting for the moment the energy consumed by the switchable converter itself and other energy losses, delivers this energy to the load.
  • the dimmer load 304 further comprises a control block 310 which controls the operation of the switchable converter 308.
  • control block 310 only allows the switchable converter 308 to draw power from the dimmer part of the time, for instance during a specified time window of a sub-cycle (the term sub-cycle will be defined in more detail hereinbelow). Neglecting losses, the energy drawn by the switchable converter during the specified time window is equal to the energy required by the load during the complete sub-cycle. Since the window is shorter than the sub-cycle, the power drawn by the converter during this window is greater than the power of the load, which power is supplied over the whole sub-cycle.
  • sub-cycle is used herein to describe an integral number of mains half-cycles.
  • the specified time window, corresponding to the first interval may be 2 mains half-cycles
  • the sub-cycle may be 6 mains half-cycles if the first interval is followed by 4 half-cycles during which the dimmer does not conduct at all.
  • the switchable converter would draw energy from the mains for two half-cycles, but supply this energy over all 6 half-cycles: during the two half-cycles the switch mode converter draws three times the power from the dimmer than it would were it to be continuously drawing energy from the dimmer.
  • the invention will generally be used where the dimmer is not fully on, but is in a heavily dimmed state: the power drawn by the switchable converter during the dimmer-on interval will then be significantly higher than it would be were the dimmer always on; however, the increase in drawn power (by a factor of the sub-cycle time divided by the window time, neglecting losses) still holds, for this " window-controlled sub-cycle" operation.
  • sub-cycle describes an integral number of mains half-cycles
  • the first and second intervals discussed hereunder need not total to an integral number of mains half-cycles, but may total to a non-intragral number of mains half-cycles. In that case, there may be a delay between the end of a second interval and the start of a next subsequent first interval. Such a delay may be useful in order that the next subsequent first interval commences at a zero-crossing of the mains supply.
  • a non-limiting example of a switchable converter which may be used according to embodiments of the invention is a PFC (power factor converter).
  • PFC power factor converter
  • the PFC stage is supplying energy only during part of the sub-cycle, whilst the load, such as a CFL lamp or a LED lamp, requires power to be supplied over the complete sub-cycle there needs to be some energy buffer such as an intermediate bus capacitor, inside the application.
  • the energy buffer may be inside the load 306 or the switchable converter 308 or may be a separate block within the connection between the load and the switchable converter and shown as arrow 312.
  • the switchable converter 308 does not necessarily have to convert power during the complete conduction angle as set by the dimmer. For instance it may be provided that the switchable converter converts power only during part of a conduction angle, and then does not conduct for the whole of one or more subsequent conduction angles. This will be considered in more detail in relation to the non-limiting example of smart lighting on stand-by, below.
  • the dimmer itself may now be considered to be operating as a "slave” rather than as a "master”: the possibility for more flexibility in the management of the control of the power arises.
  • the function of the switchable converter is then twofold: firstly to deliver the proper average power (over time) in order to supply the requirements of the load; and secondly, to draw power from the dimmer, across the window, in such a way that the dimmer can properly operate.
  • proper operation means that the switching element in the dimmer, such as a triac, is loaded by a sufficiently high current to maintain it in and on-state once it has been fired.
  • the load may only require intermittent power.
  • delivering the proper average power over time in order to supply the requirements of the load may include supplying power at a variable level or even intermittently.
  • Control block 310 includes a zero-crossing generation block 410, which enables the control to determine the start (or end) of the mains half-cycle, so as to ensure that the control remains in synchronisation with the mains.
  • the zero-crossing generation block 410 includes dv/dt detection 412, zero-crossing detection 414 and a prediction block 416.
  • the zero-crossing generation block 410 takes as input the difference (d1-d2) between line voltage d1 and the dimmer output d2. Assuming that the capacitor across the dimmer output dominates, almost the complete amplitude of the mains is present at the inlets (d1,d2) when the dimmer is off.
  • the signal dVin/dt gives the steepness of the mains line voltage d1, and can be sued to determine triggering event.
  • Waveforms relevant to this control are shown at figure 5 for a leading edge dimmer, and at figure 6 for a trailing edge dimmer respectively.
  • the zero-crossings can be directly detected only around the first interval (that is to say, when the dimmer is conducting during at least a part of the half-cycle), or end of each active cycle, provided that the (bleeder) current is sufficient to prevent the triac from extinguishing before the mains voltage zero crossing.
  • the zero-crossings cannot be directly detected, but are predicted by means of the prediction block 416.
  • the output of the prediction block is a continuous stream of zero-crossings, which continues even when no mains can be detected.
  • the absence of a steep dv/dt pulse can be used as indication that the dimmer triac was not fired.
  • the prediction block may extrapolate zero-crossings based on one or more sensed zero-crossings and time information. If an accurate timing is present, such as a quartz crystal that is often a basic part of a microcontroller system, there are only two zero-crossings needed to predict the next ones. In cases in which the mains frequency is also known, a single zero-crossing may be sufficient to predict the later zero-crossings.
  • ensuring synchronisation of the controller with the phase of the mains voltage may be necessary, in order to prevent a disturbance of the firing network of the dimmer.
  • Triac dimmers typically use a firing network, often including a diac and an RC network.
  • a basic diagram of such a triac dimmer including a conventional firing network is shown in Figure 7 .
  • the circuit shows triac T1, connected in series with an EMI-suppressing coil L1, between input voltage V1 and ground in parallel with a smoothing capacitor C2.
  • the gate of the triac is supplied through diac X1.
  • a resistor R2 is generally provided, connected between gate of T1 and ground, in order to prevent unwanted switch-on of the triac T1.
  • the input to diac X1 is connected between V1 and ground, through the RC network R1 and C1.
  • R1 is either the dimmer potentiometer itself, or is adjustable by means of the dimmer switch.
  • the firing network R1, C1 is supplied only to a minimal extent, due to the small voltage drop across the triac, which is effectively being zero.
  • the triggering network starts charging C1, starting at a voltage approximately zero or relative close to zero. This means that the firing angle of the next cycle is almost completely determined by the mains voltage shape after the zero-crossing. It should be noted that, in practice, the firing angle is dependent on history to some extent, since some energy may remain in the capacitor C1 after firing the triac, depending on the properties of the trigger device X1.
  • FIG 8 shows schematic of a circuit that consumes zero, or almost zero, power, when the dimmer is not conducting.
  • a triac dimmer is connected to an AC mains (V2) and loaded with a resistor R3 that can be switched off by, for instance, a voltage programmable resistor (X3).
  • a switch may be used, or a PFC (power factor control) stage may be switched on, in order to provide the loading.
  • the resistor X3 is equal to the voltage between Rp and Rm. The load may thus be switched to a mode where it consumes almost no power from the mains during the off window.
  • C1 When the connection between the dimmer and the load is re-established close to a zero-crossing, C1 is charged similar to the situation in which there was no power switch off; in other words, the firing angle during the interval where power is taken is not significantly changed compared with the situation where this power is continuously taken.
  • Figures 9 and 10 show, against time on the x-axis or abscissa, plots of the current through R3 at 910 and 1010; the voltage across the input terminals of the programmable switch X3 at 920 and 1020; the input mains voltage at 930 and 1030; and the voltage Vdiac across the diac at 940 and 1040, in Figures 9 and 10 , respectively for a controller in which the power-supplying first interval is, and is not, properly synchronized with the mains zero-crossing.
  • the start of the first interval is synchronized close to the zero-crossing of the mains (shown at about 12ms and 10ms respectively), whilst in figure 10 the first interval is started at 6ms, which is significantly different from the 10ms position of the zero-crossing.
  • Vdiac starts with a pre-biasing voltage of the wrong sign, making it impossible to reach the trigger level of the diac before the next zero-crossing and therefore no firing at all and disturbance of the dimming process.
  • FIG 11 shows plots against time of the same currents and voltages, as well as a plot of the voltage at the dimmer terminal, that is, the voltage V T2 at terminal T2 of X3 in figure 8 , at 1350.
  • the firing network operates in the wrong mode.
  • the zero-crossing generation including predicting future zero-crossings is carried out before the load is disconnected.
  • Figure 12 shows a block diagram of a control block according to an embodiment implementing the above features: in this embodiment, the control block 310 include zero-crossing generation block 410, together with logic 1210.
  • a signal 'enable window' defines the desired length of the window, during which the dimmer is able to supply power, that is to say, it defines the first interval.
  • the first interval may be a single half-cycle, or may be multiple half-cycles. In other embodiments, the first interval may be shorter than a single half-cycle.
  • the first interval may be shorter than the conduction angle of the dimmer, such that, in order to transfer the same energy as would be the case were the dimmer to be conducting over the whole of its conduction window, it has to operated at a higher power for the shorter first interval.
  • the logic block 1210 synchronizes the enable window with the zero-crossings of the mains voltage in order to maintain proper operation of the firing network of the dimmer. In some embodiments this block may also, when no firing is detected, disconnect the load close to a zero-crossing of the mains voltage and reconnect the load to the dimmer at the next, or a subsequent zero-crossing of the mains. The triac should then fire according to the correct operation. In some embodiments, in case that no zero-crossing signal is available, logic 1210 can be set to disconnect the load from the dimmer for a few mains cycles in order to sense the zero-crossings and lock the zero-crossing generation block, as discussed above.
  • Some embodiments of the invention may be used for instance to supply stand-by power to a controller such as a smart lighting controller.
  • the controller may only require a minimal level of power, sufficient only to ensure that the controller "wakes up" when required.
  • Such power may generally be supplied by a battery or capacitor. However, when the charge in the battery or capacitor falls below a certain level, it will require recharging. The recharging may be through the lighting dimmer and may require only a small amount of energy.
  • the dimmer were to provide this energy spread across the whole of one conduction angle, it may be that the power level would be too low to trigger the dimming device (either a triac or transistor), particular if the dimmer is set so as not to heavily dim - that is so the conduction angle is a large part - or even all, of the half-cycle.
  • the first interval may be only a part of the conduction angle of the dimmer. Since the energy is then drawn during only a shorter interval than the conduction angle, the power level is thus higher than would be the case were the energy transfer to occur over the complete conduction angle.
  • controllers for trailing edge phase cut AC supplies may fall within the scope of the invention.
  • the power level during conduction of the dimmer switch - which typically in this case is a MOS transistor, should be maintained at a sufficiently high level that the switch does not turn-off prematurely, before the end of the conduction-angle (or, in the case of a window or first interval which is smaller than the conduction angle, before the end of the window).
  • synchronisation with the mains zero crossing may be less critical, provided only that the timing is sufficiently nearly synchronised that the window does not completely miss the conduction angle (which could possibly be the case under very heavily dimmed operation).
  • phase-cut dimmers such as are commonly used in lighting circuit
  • the skilled person will appreciate that the invention is not limited thereto, but extend to other leading edge or trailing edge phase-cut AC supplies designed for applications other than lighting, such as power control for an electric fan by phase cut control.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP11194264.5A 2011-12-19 2011-12-19 Procédé et appareil de gestion d'alimentation fournie à partir d'une alimentation CA à découpe de phase Withdrawn EP2608636A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11194264.5A EP2608636A1 (fr) 2011-12-19 2011-12-19 Procédé et appareil de gestion d'alimentation fournie à partir d'une alimentation CA à découpe de phase

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11194264.5A EP2608636A1 (fr) 2011-12-19 2011-12-19 Procédé et appareil de gestion d'alimentation fournie à partir d'une alimentation CA à découpe de phase

Publications (1)

Publication Number Publication Date
EP2608636A1 true EP2608636A1 (fr) 2013-06-26

Family

ID=45444426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11194264.5A Withdrawn EP2608636A1 (fr) 2011-12-19 2011-12-19 Procédé et appareil de gestion d'alimentation fournie à partir d'une alimentation CA à découpe de phase

Country Status (1)

Country Link
EP (1) EP2608636A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2890220A1 (fr) * 2013-12-24 2015-07-01 Nxp B.V. Contrôleur de circuit de purge
CN106851907A (zh) * 2017-02-08 2017-06-13 广西交通科学研究院有限公司 一种通过隧道车辆声音检测进行调光的控制方法
WO2019134852A1 (fr) 2018-01-02 2019-07-11 Signify Holding B.V. Circuit d'attaque d'éclairage, système d'éclairage et procédé de commande
WO2019229590A1 (fr) * 2018-05-28 2019-12-05 Hau King Kuen Gradateur universel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060273775A1 (en) * 2005-06-06 2006-12-07 Lutron Electronics Co., Inc. Power supply for a load control device
US20080054728A1 (en) * 2006-09-06 2008-03-06 Tom Watson Systems and methods for providing electrical power from an alternating current power source
WO2010027254A1 (fr) * 2008-09-05 2010-03-11 Eldolab Holding B.V. Application d'éclairage à base de del
US20100320840A1 (en) * 2009-06-18 2010-12-23 Adsp Consulting, Llc Method and Apparatus for Driving Low-Power Loads from AC Sources
WO2011045057A1 (fr) * 2009-10-14 2011-04-21 Tridonic Uk Limited Procédé pour commander la luminosité d'une led
WO2011056068A2 (fr) * 2009-11-05 2011-05-12 Eldolab Holding B.V. Circuit d'attaque à diodes électroluminescentes permettant d'alimenter une unité à diodes électroluminescentes à partir d'un transformateur électronique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060273775A1 (en) * 2005-06-06 2006-12-07 Lutron Electronics Co., Inc. Power supply for a load control device
US20080054728A1 (en) * 2006-09-06 2008-03-06 Tom Watson Systems and methods for providing electrical power from an alternating current power source
WO2010027254A1 (fr) * 2008-09-05 2010-03-11 Eldolab Holding B.V. Application d'éclairage à base de del
US20100320840A1 (en) * 2009-06-18 2010-12-23 Adsp Consulting, Llc Method and Apparatus for Driving Low-Power Loads from AC Sources
WO2011045057A1 (fr) * 2009-10-14 2011-04-21 Tridonic Uk Limited Procédé pour commander la luminosité d'une led
WO2011056068A2 (fr) * 2009-11-05 2011-05-12 Eldolab Holding B.V. Circuit d'attaque à diodes électroluminescentes permettant d'alimenter une unité à diodes électroluminescentes à partir d'un transformateur électronique

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2890220A1 (fr) * 2013-12-24 2015-07-01 Nxp B.V. Contrôleur de circuit de purge
US9532416B2 (en) 2013-12-24 2016-12-27 Silergy Corp. Bleeder circuit controller
CN106851907A (zh) * 2017-02-08 2017-06-13 广西交通科学研究院有限公司 一种通过隧道车辆声音检测进行调光的控制方法
CN106851907B (zh) * 2017-02-08 2018-04-24 广西交通科学研究院有限公司 一种通过隧道车辆声音检测进行调光的控制方法
WO2019134852A1 (fr) 2018-01-02 2019-07-11 Signify Holding B.V. Circuit d'attaque d'éclairage, système d'éclairage et procédé de commande
US11083058B2 (en) 2018-01-02 2021-08-03 Signify Holding B.V. Lighting drive, lighting system and control method
WO2019229590A1 (fr) * 2018-05-28 2019-12-05 Hau King Kuen Gradateur universel

Similar Documents

Publication Publication Date Title
US8981661B2 (en) Powering high-efficiency lighting devices from a triac-based dimmer
US9071144B2 (en) Adaptive current control timing and responsive current control for interfacing with a dimmer
US9307601B2 (en) Input voltage sensing for a switching power converter and a triac-based dimmer
EP2590477B1 (fr) Procédé de contrôle de ballast, ballast, contrôleur d'éclairage et processeur de signaux numériques
US6972531B2 (en) Method for operating at least one low-pressure discharge lamp
JP6190396B2 (ja) 回路装置
US8729729B2 (en) Method and apparatus for driving low-power loads from AC sources
US9101010B2 (en) High-efficiency lighting devices having dimmer and/or load condition measurement
EP2741586A1 (fr) Détermination du passage à zéro approximatif de tension d'entrée de convertisseur de puissance de commutation
US20140159611A1 (en) Driver device and driving method for driving a load, in particular an led unit
EP2752090B1 (fr) Dispositif d'entraînement et procédé d'entraînement pour entraîner une charge, et possédant un circuit de fuite dépendant de la polarité
EP3595414A1 (fr) Dispositif de gradation de lumière
EP2608636A1 (fr) Procédé et appareil de gestion d'alimentation fournie à partir d'une alimentation CA à découpe de phase
CN105050232A (zh) 用于功率转换器中的调光器边沿探测的采样
EP3319400A1 (fr) Dispositif gradateur
JP2004505593A (ja) インタフェース回路及び方法
EP2890220B1 (fr) Contrôleur de circuit de purge
WO2013003810A1 (fr) Détection de tension d'entrée destinée à un convertisseur de puissance de commutation et gradateur de lumière de type triac
EP3349546A1 (fr) Dispositif de commande d'éclairage
US8994283B2 (en) Circuit for controlling a lighting unit having a periodic power supply with a thyristor
EP2810534B1 (fr) Dispositif et procédé d'attaque de charge, en particulier une unité de del
GB2572001A (en) Emergency lighting buck converter
BE1019523A5 (nl) Nuldoorgangsdetector, gebruik van een dergelijke detector en dimmer omvattende een dergelijke detector.
TWI517760B (zh) 螢光燈驅動控制電路

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140103