WO2012031901A2 - Procédé et appareil permettant de commander un diviseur de tension relié à un gradateur à coupure de phase - Google Patents

Procédé et appareil permettant de commander un diviseur de tension relié à un gradateur à coupure de phase Download PDF

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Publication number
WO2012031901A2
WO2012031901A2 PCT/EP2011/064624 EP2011064624W WO2012031901A2 WO 2012031901 A2 WO2012031901 A2 WO 2012031901A2 EP 2011064624 W EP2011064624 W EP 2011064624W WO 2012031901 A2 WO2012031901 A2 WO 2012031901A2
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WO
WIPO (PCT)
Prior art keywords
time period
bleeder
input voltage
phase
cycle
Prior art date
Application number
PCT/EP2011/064624
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English (en)
Other versions
WO2012031901A3 (fr
Inventor
Xuewei Dai
Original Assignee
Osram Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Osram Ag filed Critical Osram Ag
Publication of WO2012031901A2 publication Critical patent/WO2012031901A2/fr
Publication of WO2012031901A3 publication Critical patent/WO2012031901A3/fr

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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
    • H05B45/357—Driver circuits specially adapted for retrofit LED light sources
    • H05B45/3574—Emulating the electrical or functional characteristics of incandescent lamps
    • H05B45/3575—Emulating the electrical or functional characteristics of incandescent lamps by means of dummy loads or bleeder circuits, e.g. for dimmers

Definitions

  • the present application relates to illumination field, in particular to a method and apparatus for controlling bleeder connected to phase-cut dimmer.
  • Fig. 1 shows a structural diagram of a typical dimmer system.
  • the typical dimmer system comprises illumination apparatus, driver and dimmer, wherein, the driver is provided with dimming control circuit, and the dimmer may cut off phase of input voltage.
  • Fig. 3 shows ideal and correct waveforms as detected.
  • the dimming control circuit like microcontroller (referred to as MCU for short) may have a comparator which compares the phase detect signal to a fixed voltage V ref and generates a comparison result.
  • the MCU can measure the time duration of high level voltage of the phase detect signal and calculate the cutting-off phase.
  • Fig. 4 (1) shows ideal phase detect signal in the case that the dimmer performs Trail
  • Fig. 4 (3) shows ideal phase detect signal in the case that the dimmer performs Triac.
  • the high level voltage duration time of the phase detect signal also stands for the dimmer's phase in that cycle.
  • a bleeder resistor is used to discharge the capacitor in dimmers, as shown in Fig. 2.
  • MCU outputs a high voltage used as control signal to bleeder to open the MOS bleeder (referred to as "open the bleeder" for short) when phase detect signal is lower than a fixed voltage V ref .
  • This current makes the capacitor discharge quickly.
  • a dimming system including this bleeder circuit should have waveforms as Fig. 5 (1 ) and Fig. 5 (2).
  • the moment for opening the bleeder (that is, moment which makes bleeder control signal to be high-level) needs to be found.
  • the dimming type can be determined as Triac; if it drops suddenly, then the dimming type can be determined as Trail. This can be realized by the calculation of slope of input voltage V in . Then, if it is Trail, when the sudden-change-point comes, as point 1 in Fig. 5, open the bleeder.
  • This method has some weaknesses. First, the process is very complicated. It is needed to distinguish the dimming type from Triac and Trail and open the bleeder differently.
  • MCU can not sample the voltage all the time. MCU takes time to run the code, i.e. to run the code in the sample interval. So the sample interval can not be very short. Normally, the code running time is 200 ⁇ to 300 ⁇ . So sample interval will be longer than the code running time, which will result in a limit of the sample precision. The bleeder may open a bit later and the phase detected is longer, affecting the dimming precision.
  • a main object of the present invention is to provide a method for controlling a bleeder connected to a phase-cut dimmer and an apparatus for controlling a bleeder connected to a phase- cut dimmer.
  • a method for controlling a bleeder connected to a phase-cut dimmer is provided.
  • the waveform change cycle of the input voltage of the phase-cut dimmer is referred to as an input voltage cycle.
  • the method comprises: determining a first time period during which input voltage is lower than a predetermined reference voltage using at least one preceding input voltage cycle; opening the bleeder in the first time period in a later input voltage cycle; closing the bleeder in a second time period, wherein the second time period equals to the input voltage cycle minus the updated first time period, wherein the updated first time period equals to a sum of the first time period and a predetermined advancing time period; and repeating the steps of opening and closing the bleeder using the updated first time period.
  • an apparatus for controlling a bleeder connected to a phase-cut dimmer is further provided.
  • the waveform change cycle of an input voltage is referred to as an input voltage cycle.
  • the apparatus comprises: a first time period determining module for determining a first time period during which the input voltage is lower than a predetermined reference voltage using at least one preceding input voltage cycle; a first bleeder controlling module for opening bleeder in the first time period in a later input voltage cycle; a second bleeder controlling module for closing bleeder in a second time period, wherein the second time period equals to the input voltage cycle minus the an updated first time period, wherein the updated first time period equals to a sum of the first time period and a predetermined advancing time period; and a third bleeder controlling module for repeating the steps of opening and closing the bleeder using the updated first time period.
  • the embodiments of the present invention further provide a computer program product in at least computer readable medium form, on which computer program code for implementing the method for controlling the bleeder connected to phase-cut dimmer is recorded.
  • the present invention may control the bleeder connected to the phase-cut dimmer without distinguishing the dimming from the Triac and Trail, thereby simplifying processes and reducing calculation.
  • Fig. 1 is a block diagram showing a typical dimming system
  • FIG. 2 is a circuit diagram showing a typical bleeder
  • Fig. 3 shows ideal voltage waveform diagram of Triac and Trail
  • Fig. 4 is voltage waveform diagram and phase detect signal waveform diagram without using bleeder to bleed;
  • FIG. 5 voltage waveform diagram and phase detect signal waveform diagram using bleeder to bleed;
  • Fig. 6 is a flow chart showing the method for controlling the bleeder connected to the phase-cut dimmer according to one embodiment of the present invention
  • Fig. 7 is a flow chart showing the method for controlling the bleeder connected to the phase-cut dimmer according to embodiments of the present invention.
  • Fig. 8 shows voltage waveform diagram and phase detect signal waveform diagram when executing the method for controlling the bleeder connected to the phase-cut dimmer according to embodiments of the present invention
  • Fig. 9 is a schematic view showing the time required by the voltage waveform to get a steady state.
  • Fig. 10 is a block diagram showing an apparatus for controlling the bleeder connected to the phase-cut dimmer according to another embodiment of the present invention.
  • Fig. 6 the method for controlling the bleeder connected to the phase-cut dimmer according to one embodiment of the present invention is described, wherein there is capacitor arranged in the phase-cut dimmer.
  • the waveform change cycle of the Input voltage of the phase-cut dimmer is referred to as an input voltage cycle.
  • step 602 determine a first time period during which the input voltage is lower than a predetermined reference voltage using at least one preceding input voltage cycle.
  • step 604 open the bleeder in the first time period from the moment when the input voltage becomes lower than the predetermined reference voltage in a later input voltage cycle.
  • step 606 close the bleeder in a second time period from the moment when the input voltage becomes higher than the predetermined reference voltage, wherein the second time period equals to input voltage cycle minus an updated first time period, and the updated first time period equals to a sum of the first time period and the predetermined advancing time period.
  • step 608 repeat the steps of opening and closing the bleeder using the updated first time period.
  • the advancing time period can be determined according to the time required for discharging the capacitor, wherein the capacitor may be output capacitor in the dimmer or input capacitor in the driver circuit, or both of the output capacitor and input capacitor. Output capacitor will prevent the voltage from changing suddenly and the input capacitor smoothes voltage after the bridge.
  • the manner of determining the advancing time period is not limited thereto, and the advancing time period may be determined according to other appropriate manners.
  • the above updating the first time period and the repeating the steps of opening and closing the bleeder using the updated first time period may not necessarily be performed continuously for the continuous input voltage cycles.
  • the first time period may keep unchanged in at least one cycle, and the unchanged first time period may be used to repeat the steps of opening and closing the bleeder. That is, two successive updates of the first time period are separated with N input voltage cycles, wherein N is an integer greater than or equal to 1.
  • N is an integer greater than or equal to 1.
  • the value of N is determined according to the time required by the output voltage of the phase-cut dimmer to get stable, frequency of the input voltage, and the time period during which the bleeder is in an open state.
  • Fig. 7 is a flow chart of one example showing the method for controlling the bleeder connected to phase-cut dimmer according to embodiments of the present invention
  • Fig. 8 shows voltage waveform diagram and phase detect signal waveform when executing the method for controlling the bleeder connected to phase-cut dimmer according to embodiments of the present invention.
  • step 720 dimmer control circuit (for example, MCU) opens the bleeder normally, that is, set the bleeder control signal as 1 . Then, the dimmer control circuit may record the time T phase0 in Fig- 8(1), as shown in steps 718-722 in Fig. 7. Secondly, when the phase detect signal changes to high-level, the dimmer control circuit waits a time duration of T open_bleeder which equals to T phase0 minus T ear l ier , and then open the bleeder, as shown in steps 712-716 in Fig. 7 and Fig.
  • T open_bleeder which equals to T phase0 minus T ear l ier
  • T phase1 will change accordingly, and shorter than T phase0 .
  • T phase will continue be shorter until the ideal dimmer phase, as shown in Fig. 8(3). Now, it will be a balance that T phaseN equals to T phaseN - 1 , without being shorter, even when the bleeder opens ahead of time. Now, the desired waveform, that is, an ideal waveform, is obtained.
  • T phase now as ideal dimmer phase in Fig. 4(1 ).
  • Input voltage V in can be high in terms of Trail, so the consumption is large.
  • the value can be obtained according to the conversion of energy, because the energy is used to discharge the capacitor in the dimmer.
  • T discharge l/24*C*(Vm-12V)*R bleeder (2).
  • C is the capacitance of the capacitor in the dimmer.
  • the bleeder power P bleeder is large if we open the bleeder cycle by cycle, and further reduce the efficiency. Typically Pbieeder takes 10% of efficiency if the power of the driver is 10W. But we can reduce this value by reducing the frequency that we open the bleeder ahead of time (not open the bleeder normally). This is the third step we talked above. However, low frequency to pen bleeder ahead of time will result in a long time for the waveform to be stable state until T phase is fixed. Provided that the time to be stable state is T change , and the cutting-off phase is the biggest, as shown Fig. 9.
  • T total-discharge is representative of the total discharging time of the capacitor
  • T cycle is representative of a time of one cycle.
  • N T stable * T discharge / (T cycle * T cycle )
  • N 8.
  • the apparatus 1000 for controlling the bleeder connected to the phase-cut bleeder comprises: a first time period determining module 1002 for determining a first time period during which the input voltage is lower than a predetermined reference voltage using at least one preceding input voltage cycle; a first bleeder controlling module 1004 for opening the bleeder in the first time period from the moment when the input voltage becomes lower than the predetermined reference voltage in a later input voltage cycle; a second bleeder controlling module 1006 for closing the bleeder in a second time period from the moment when the input voltage becomes higher than the predetermined reference voltage, wherein the second time period equals to input voltage cycle minus updated first time period, wherein the updated first time period equals to the sum of the first time period and the predetermined advancing time period; and a third bleeder controlling module 1008 for repeating the steps of opening and closing the bleeder using the updated first time period.
  • the apparatus 1000 may further comprise an advancing time period determining module (not shown) for determining the advancing time period using the time required for discharging the capacitor.
  • the third bleeder controller module 1008 may be further configured to make two successive updates of the first time period to be separated with N input voltage cycles, wherein N is an integer greater than or equal to 1.
  • the apparatus 1000 may further comprise times determining module for determining the value of N according to the time required by output voltage of the phase-cut dimmer to get stable, frequency of the input voltage, and the time period during which the bleeder is in open state.
  • Embodiments of the present invention will be applied to Triac and Trail.
  • the process of phase measuring may be simplified, preciseness may be improved and cost of the dimming controller circuit (for example MCU) may be reduced.
  • the object of the present invention may be further achieved by running one program or a set of programs on any information processing device.
  • the information processing device may be recognized universal devices. Therefore, the object of the present invention may also be achieved by only providing program product including program code implementing the method or device. That is, such a program produce also constitutes the present invention, and medium stored with or transmitting such a program product also constitutes the present invention.
  • the storage or transmission medium may be any type of storage or transmission medium well known to those skilled in the art, or later to be developed, so it is not necessary to list one by one various storage or transmission media here.
  • each component or each step may be disassembled, combined and/or recombined after being disassembled.
  • Those disassembling and/or recombining shall be regarded as equivalent solutions of the present invention.
  • the step performing the above series of processes may be executed naturally in time order according to the order of the Description, but not necessarily executed in time order. Some steps may be executed in parallel or independently from each other.
  • features described and/or illustrated for one embodiment may be used in one or more other embodiments in the same or similar manner, be combined with features in other embodiments or replace features in other embodiments.

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  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne un procédé et un appareil de commande d'un diviseur de tension relié à un gradateur à coupure de phase, le procédé consistant à : déterminer une première période de temps pendant laquelle la tension d'entrée est inférieure à une tension de référence prédéterminée en utilisant au moins un cycle de tension d'entrée précédent; ouvrir le diviseur de tension dans la première période de temps dans un cycle de tension d'entrée suivant; fermer le diviseur de tension dans une seconde période de temps, la seconde période de temps étant égale au cycle de tension d'entrée moins la première période de temps actualisée, où la première période de temps actualisée équivaut à la somme de la première période de temps et d'une période de temps d'avancement prédéterminée; et répéter les étapes d'ouverture et de fermeture du diviseur de tension en utilisant la première période de temps actualisée. La présente invention permet de commander un diviseur de tension relié à un gradateur à coupure de phase sans distinguer les types de gradation de Triac à Trail, ce qui permet de simplifier le processus et de réduire les calculs.
PCT/EP2011/064624 2010-09-10 2011-08-25 Procédé et appareil permettant de commander un diviseur de tension relié à un gradateur à coupure de phase WO2012031901A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010280160.8 2010-09-10
CN201010280160.8A CN102404899B (zh) 2010-09-10 2010-09-10 对连接至切相调光器的泄流器进行控制的方法和装置

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WO2012031901A2 true WO2012031901A2 (fr) 2012-03-15
WO2012031901A3 WO2012031901A3 (fr) 2012-08-30

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2747519A1 (fr) * 2012-12-21 2014-06-25 Schneider Electric (Australia) Pty Limited Procédé et appareil de commande de gradation lumineuse et système idoine
EP2866521A1 (fr) * 2013-09-25 2015-04-29 Toshiba Lighting & Technology Corporation Dispositif d'alimentation en énergie, luminaire et système d'éclairage
CN104868703A (zh) * 2014-02-20 2015-08-26 Dialog半导体（英国）有限公司 无辅助绕组的高压转换器
US9736905B2 (en) 2014-03-18 2017-08-15 Philips Lighting Holding B.V. Bleeder control arrangement
US9912246B2 (en) 2013-06-27 2018-03-06 Philips Lighting Holding B.V. Bleeder circuit for a dimmer of a light non-linear load

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CN104010422B (zh) * 2014-06-13 2016-03-23 成都芯源系统有限公司 Led驱动装置及其控制器和控制方法

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JP2007538378A (ja) * 2004-05-19 2007-12-27 ゲーケン・グループ・コーポレーション Ｌｅｄ照明コンバータ用の動的緩衝
US7102902B1 (en) * 2005-02-17 2006-09-05 Ledtronics, Inc. Dimmer circuit for LED
US7656103B2 (en) * 2006-01-20 2010-02-02 Exclara, Inc. Impedance matching circuit for current regulation of solid state lighting
US7288902B1 (en) * 2007-03-12 2007-10-30 Cirrus Logic, Inc. Color variations in a dimmable lighting device with stable color temperature light sources
GB0811713D0 (en) * 2008-04-04 2008-07-30 Lemnis Lighting Patent Holding Dimmer triggering circuit, dimmer system and dimmable device

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2747519A1 (fr) * 2012-12-21 2014-06-25 Schneider Electric (Australia) Pty Limited Procédé et appareil de commande de gradation lumineuse et système idoine
US9445479B2 (en) 2012-12-21 2016-09-13 Schneider Electric (Australia) Pty Ltd. Dimming control method and apparatus and dimming system
US9912246B2 (en) 2013-06-27 2018-03-06 Philips Lighting Holding B.V. Bleeder circuit for a dimmer of a light non-linear load
EP2866521A1 (fr) * 2013-09-25 2015-04-29 Toshiba Lighting & Technology Corporation Dispositif d'alimentation en énergie, luminaire et système d'éclairage
CN104868703A (zh) * 2014-02-20 2015-08-26 Dialog半导体（英国）有限公司 无辅助绕组的高压转换器
US9736905B2 (en) 2014-03-18 2017-08-15 Philips Lighting Holding B.V. Bleeder control arrangement

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Publication number Publication date
CN102404899B (zh) 2015-07-01
WO2012031901A3 (fr) 2012-08-30
CN102404899A (zh) 2012-04-04

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