EP3711457A1 - Betriebsschaltung für ein led-leuchtmittel - Google Patents
Betriebsschaltung für ein led-leuchtmittelInfo
- Publication number
- EP3711457A1 EP3711457A1 EP18803354.2A EP18803354A EP3711457A1 EP 3711457 A1 EP3711457 A1 EP 3711457A1 EP 18803354 A EP18803354 A EP 18803354A EP 3711457 A1 EP3711457 A1 EP 3711457A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- operating
- speed
- voltage level
- threshold
- 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.)
- Pending
Links
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]
- H05B45/10—Controlling the intensity of the light
-
- 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]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- 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]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Definitions
- the present invention relates to an operating circuit for an LED lamp.
- LED light-emitting diodes
- operating circuits are typically used, which act from a country-typical mains voltage, such as an AC voltage of 230V or 120V, a suitable for the operation of the LEDs operating signal.
- a country-typical mains voltage such as an AC voltage of 230V or 120V
- a suitable for the operation of the LEDs operating signal With this operating signal, it is possible, for example, to generate a constant current level.
- the operating signal can also be generated with a constant voltage level.
- the generation of the operating signal can be carried out in a two-stage manner, by first using a boost converter, a DC voltage is generated, which is then in turn converted by means of a down converter into the operating signal. In this way, the operating signal can be generated in an efficient manner and with a low interference signal component.
- a power factor correction can be implemented by means of the boost converter.
- the DC voltage generated by the boost converter may break. This may be due in particular to a relatively sluggish reaction behavior of the boost converter. Such a break in the DC voltage can in turn affect the operation of the Abissuewand lers to which it is supplied. For example, this can lead to undesirably high current peaks of the operating signal, which can damage the LED resource. Furthermore, it can lead to a failure of the LED equipment.
- responsiveness of the boost converter to avoid such problems is often barely possible without compromising the efficiency of the boost converter and thus the overall operating circuitry.
- an operation circuit for an LED luminaire according to claim 1 and a method according to claim 8 are provided.
- the dependent claims define further forms of execution.
- an LED lighting operation circuit thus comprises an input stage for generating a DC voltage from a mains voltage supplied to the operating circuit, e.g. by means of an up-converter. Furthermore, the operating circuit comprises a step-down converter for converting the DC voltage into an operating signal for the LED illuminant. Furthermore, the operating circuit comprises a controller. The controller is configured to monitor a voltage level of the DC voltage and a voltage level of the operating signal. Furthermore, the controller is configured to control a speed of an adjustment operation of the operating signal depending on the monitored voltage levels. In this way, excessive load changes at the output of the input stage and thereby caused dips in the DC voltage and instabilities of the buck converter can be avoided.
- the controller is configured to monitor a difference between the voltage level of the DC voltage and the voltage level of the operating signal. In this way, in particular it can be determined whether there is a risk that the voltage level of the DC voltage drops below the voltage level of the operating signal, which in turn could affect the operation of the buck converter.
- the controller may in particular be designed to increase the speed of the adaptation process reduce if the difference falls below a first threshold. By means of this threshold value, it can be ensured that the speed of the adaptation process is reduced before the voltage level of the DC voltage drops below the voltage level of the operating signal.
- the controller may be configured to increase the speed of the adjustment process when the difference exceeds a second threshold.
- the second threshold value may be higher than the first threshold value, so that a hysteresis behavior with respect to changing speeds of the adaptation process is achieved and an excessive change of the speeds in the vicinity of the threshold values is avoided.
- the adaptation process may in particular comprise a dimming of the LED lighting means.
- the controlled speed may include a speed of dimming. Instabilities caused by fast dimming processes in the generation of the operating signal for the LED lamp can thus be efficiently avoided.
- a difference between the voltage level of the DC voltage and the voltage level of the operating signal can be monitored.
- the speed of the adjustment process can be reduced if the diff falls below a first threshold, and / or the speed of the foundedsvo gangs gang be increased if the difference exceeds a second threshold.
- the second threshold is preferably higher than the first threshold.
- FIG. 1 schematically illustrates an operating circuit according to an embodiment
- FIG. 2A shows exemplary signal curves during a dimming process.
- FIG. 2B shows exemplary signal curves during a dimming process with monitoring of voltage levels and speed control according to an export example.
- FIG. 3 shows a flow chart for illustrating a method for operating an LED lighting device according to an exemplary embodiment.
- FIG. 1 shows an operating circuit 100 which supplies an LED lighting means 200.
- the LED illuminant 200 may include one or more LEDs, e.g. can be connected in series in a string.
- more complex circuit arrangements are possible with one or more light-emitting diodes.
- the operating circuit 100 has inputs 1 1 1, 1 12 for receiving a line voltage Vn.
- the line voltage Vn is an AC voltage, e.g. with a typical RMS value of 230V or 120V.
- the operating circuit 100 has an input stage 120.
- the input stage generates a direct voltage Vdc from the mains voltage Vn.
- the input stage 120 includes an up-converter that generates the DC voltage Vdc provided by the input stage 120 at a voltage level that is above the effective value of the line voltage Vn.
- a target value of the voltage level of the DC voltage Vdc may be about 400V.
- the boost converter 125 may be implemented as a boost converter, for example.
- the input stage 120 may, for example, comprise a rectifier, e.g. a bridge rectifier.
- the operating circuit 100 further has a step-down converter 140, which generates an operating signal S for the LED illuminant 200 from the DC voltage Vdc.
- the operating signal S is supplied to the LED illuminant 200 via outputs 13, 14.
- the down converter 140 may be implemented as a buck converter, for example.
- the operating circuit 100 supports a dimming function for the LED lighting means.
- the dimming function enables adjustment of the brightness of light generated by the LED illuminant 200. This setting can be carried out via the control 150 supplied control inputs, which are illustrated in Figure 1 by a dimming control signal DIM.
- the dimming function can, for example, on a Current control of the operating signal S, a pulse width modulation of the operating signal S or a pulse-frequency modulation of the operating signal S based.
- the controller In order to implement the dimming function, the controller generates control signals which are fed to the down converter 140 (illustrated by dashed arrows in FIG. 1). These control signals cause the down-converter 140 to adjust the operating signal S accordingly, this adjustment process being substantially uniform over a certain period of time.
- a dimming operation may involve raising the voltage level of the operating signal S uniformly from a first value to a second value over the period of time.
- a dimming operation may include reducing the voltage level of the operating signal S smoothly over a period of time from a first value to a second value.
- a dimming process may include that a current I I generated by the operating signal S is uniformly raised from a first value to a second value over the period of time by the LED illuminant. Furthermore, a dimming process may include that a current I I generated by the operating signal S is uniformly reduced by the LED lighting means over a period of time from a first value to a second value.
- the dimming process can be configured via parameters stored in the controller 150.
- a speed of the dimming process can be controlled. In the present case it is assumed that the dimming process can take place either at a higher first speed or at a lower second speed, and that it is also possible to switch between these speeds during the dimming process. It is understood, however, that more than two speeds of the dimming process could be provided.
- the controller 150 corresponding parameters can be stored. In particular, these parameters may include control parameters for regulating the voltage level of the operating signal S and / or the current I L generated by the operating signal S.
- the parameters may be configurable via a configuration interface of the operating circuit 100.
- the controller 150 further includes a voltage monitoring function 155.
- the voltage monitoring function 155 monitors the voltage level of the DC voltage Vdc and the voltage level of the operating signal S.
- the Voltage level of the DC voltage Vdc is hereinafter referred to as VI
- the clamping voltage level of the operating signal S is hereinafter referred to as V2.
- the voltage monitoring function 155 forms a difference between the voltage level VI of the DC voltage Vdc and the voltage level V2 of the operating signal S, ie, determines a voltage difference according to FIG. 1
- the voltage difference ⁇ V is then subjected to a threshold comparison.
- the speed of the dimming process is controlled.
- the speed of the dimming process is reduced when the threshold comparison shows that the voltage difference AV falls below a first threshold value Tl.
- the speed of the dimming operation is in turn increased when the threshold comparison reveals that the voltage difference AV exceeds a second threshold T2.
- the increase and decrease in the speed of the dimming operation can be realized by starting the dimming operation initially at the above higher first speed and changing the controller 150 to the above-mentioned lower second speed when the voltage difference ⁇ V falls below the first threshold Tl , Then, when the voltage difference AV rises again and exceeds the second threshold T2, the controller 150 changes back to the higher first speed.
- the speed of the dimming process can thus be dynamically adjusted in the course of the dimming process if the threshold comparison indicates that the risk exists that the voltage level VI of the DC voltage Vdc drops below the voltage level of the operating signal S.
- FIGS. 2A and 2B show exemplary signal profiles for illustrating the above-described control of the speed of the dimming process.
- FIG. 2B shows a comparison of signal curves for a corresponding dimming process with the control of the speed of the dimming process.
- FIG. 2B shows
- FIG. 2A and 2B respectively show the voltage level VI of the DC voltage Vdc, the voltage level V2 of the operating signal S, the voltage difference AV and the current II as a function of the time t.
- FIG. 2B shows the course of a control signal CTRL for selecting between the first speed and the second speed.
- a low level of the control signal CTRL corresponds to the use of the higher first speed
- a high level of the control signal CTRL corresponds to the use of the lower n second speed.
- the first speed corresponds to a change of the current IL with approximately 1 OmA / ms.
- the second speed corresponds to a change in the current IL at about 5mA / ms, ie about half of the first speed.
- the beginning and the end of the dimming process are indicated by vertical dashed lines.
- FIG. 3 illustrates an exemplary method according to which an LED illuminant 1 may be operated using the operating circuit 100 described above.
- the LED illuminant may correspond, for example, to the LED illuminant 200 described above.
- step S20 the DC voltage is converted into an operation signal for the LED bulb. This can be done by means of a down converter. As described in connection with the operating circuit 100, the buck converter may be part of a two-stage operation circuit for the LED light source and an input stage of the operating circuit arranged to be stored.
- a voltage level of the DC voltage generated at step S10 and a voltage level of the operation signal generated at step S20 are monitored. As explained in conjunction with the operating circuit 100, this can be done by means of a control of an operating circuit for the LED lighting means. In this case, in particular a difference of the voltage level of the DC voltage to the voltage level of the operating signal can be monitored.
- a speed of an adjustment operation of the operation signal is controlled depending on the voltage levels monitored at step S30. This may in particular include a choice between two or more speeds.
- the adaptation process can be a dimming process. In this case, the speed of dimming may be controlled depending on the monitored voltage levels, eg, as described above, by selecting the higher first speed or lower second speed.
- the speed of the adaptation process can be reduced if the difference in the voltage level falls below a first threshold value.
- the speed of the adjustment process may be increased if the difference in voltage levels exceeds a second threshold.
- the first voltage level is preferably lower than the second voltage level.
- an operating circuit based on the concepts described above could be implemented with various types of input stages or buck converters, without limitation to the above examples of an input stage comprising a rectifier and an aux converter and a downstream stage having a buck converter implemented downconverters.
- the illustrated concepts are not limited to dimming operations, but rather may be used in a variety of adjustment operations of the operating signal at which the speed of the adjustment operation can be controlled.
- the two-stage controllability of the speed of the adjustment process used in the illustrated examples is only an example, and that multi-level or quasi-continuous control of the speed could also be used.
- the operating circuit can be at least partially inte grated into the LED illuminant to be supplied.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017220582.2A DE102017220582A1 (de) | 2017-11-17 | 2017-11-17 | Betriebsschaltung für ein LED-Leuchtmittel |
PCT/EP2018/080279 WO2019096626A1 (de) | 2017-11-17 | 2018-11-06 | Betriebsschaltung für ein led-leuchtmittel |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3711457A1 true EP3711457A1 (de) | 2020-09-23 |
Family
ID=64308717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18803354.2A Pending EP3711457A1 (de) | 2017-11-17 | 2018-11-06 | Betriebsschaltung für ein led-leuchtmittel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3711457A1 (de) |
AT (1) | AT17945U1 (de) |
DE (1) | DE102017220582A1 (de) |
WO (1) | WO2019096626A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI711337B (zh) * | 2019-05-07 | 2020-11-21 | 益力半導體股份有限公司 | 自適應調光驅動系統 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011103638A1 (de) * | 2011-06-08 | 2012-12-13 | Tridonic Gmbh & Co. Kg | Verfahren zum Betreiben eines elektronischen Vorschaltgeräts für ein Leuchtmittel und elektronisches Vorschaltgerät |
JP2013118132A (ja) * | 2011-12-05 | 2013-06-13 | Panasonic Corp | 点灯装置およびそれを備えた照明器具 |
DE102012017397A1 (de) * | 2012-04-13 | 2013-10-17 | Tridonic Gmbh & Co. Kg | Verfahren zum Regeln einer Leistungsfaktorkorrekturschaltung, Leistungsfaktorkorrekturschaltung und Betriebsgerät für ein Leuchtmittel |
DE102012216047A1 (de) * | 2012-09-11 | 2014-03-13 | Tridonic Gmbh & Co. Kg | Einstellung einer Leistungsfaktorkorrektur für Lastkreis mit Leuchtmitteln |
AT14557U1 (de) * | 2014-09-11 | 2016-01-15 | Tridonic Gmbh & Co Kg | Getaktete Sperrwandlerschaltung |
CN108650747B (zh) * | 2014-09-16 | 2020-11-10 | 株式会社小糸制作所 | 点灯电路及使用该点灯电路的车辆用灯具 |
FR3039741B1 (fr) * | 2015-07-31 | 2020-11-27 | Koito Mfg Co Ltd | Circuit d'eclairage et lampe de vehicule l'utilisant |
-
2017
- 2017-11-17 DE DE102017220582.2A patent/DE102017220582A1/de active Pending
- 2017-12-21 AT ATGM262/2017U patent/AT17945U1/de unknown
-
2018
- 2018-11-06 EP EP18803354.2A patent/EP3711457A1/de active Pending
- 2018-11-06 WO PCT/EP2018/080279 patent/WO2019096626A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
DE102017220582A1 (de) | 2019-05-23 |
AT17945U1 (de) | 2023-08-15 |
WO2019096626A1 (de) | 2019-05-23 |
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