EP2936929A2 - Led-konverter mit froststart -punktion - Google Patents
Led-konverter mit froststart -punktionInfo
- Publication number
- EP2936929A2 EP2936929A2 EP13838083.7A EP13838083A EP2936929A2 EP 2936929 A2 EP2936929 A2 EP 2936929A2 EP 13838083 A EP13838083 A EP 13838083A EP 2936929 A2 EP2936929 A2 EP 2936929A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- led
- power
- control circuit
- temperature
- converter
- 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.)
- Granted
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
- H05B45/18—Controlling the intensity of the light using temperature feedback
Definitions
- the invention relates to an LED converter for operating an LED track and a method for operating such a LED track.
- the method relates to an LED converter with electrolytic capacitor (ELKO, ELCAP).
- LED converters for operating LED circuits are generally known, in particular also LED converters, in which an ELKO, for example after a line filter and / or a rectifier, or in the supply path of the LED track is provided.
- the electrolytic capacitor of the LED converter can not provide enough electric power for the start-up of the LED path, since a part of the electrolyte of the electrolytic capacitor may be frozen.
- electrolytic capacitors which are specified for operation at low temperatures, for example, for temperatures below -40 ° C.
- these electrolytic capacitors are compared to the standard ones
- the invention now proposes an LED converter and an operating method to solve the above-mentioned problem.
- the LED converter and the method are the subject of the independent claims. Further embodiments of the invention are the subject of the dependent claims.
- the invention provides an LED converter which is adapted to provide at least one LED track or other lighting means with at least a LED selectively, in particular depending on a temperature detection, or permanently set to operate in a low temperature operating mode.
- the LED converter has:
- connection for a voltage supply in particular an AC supply such as, for example, a
- At least one electrolytic capacitor in an electrical supply path, via which the LED route starting from one of the connectable
- Voltage supply is supplied directly or via at least one converter stage, and a
- Control circuit which is adapted to the LED track in the operating mode for low temperatures after each switching on the power supply for a predetermined or an adaptive, especially temperature-dependent period of time with a reduced power compared to the rated power, in particular with a specific dimming value operate at the end of the period of non-reduced power operation.
- the electrolytic capacitor can be supplied starting from an actuator / switching regulator, in particular a DC / DC converter and / or a constant current source. It is only important that the electrolytic capacitor is arranged in the supply path according to its polarity due to its physical properties as a polarized capacitor and is operated with a DC voltage.
- the control circuit may be supplied with a signal, in particular via a bus connected thereto, which defines at least an amount of power reduction and / or the duration.
- the control circuit may set a parameter influencing the light output of the LED path, in particular a parameter of the switching regulator or of the constant current source, preferably as a function of the signal.
- the amount of power reduction can be transmitted as a dimming value, or the signal of the control circuit can transmit an absolute value to which the power is to be reduced.
- the signal may also signal a power change relative to the current or predetermined power, eg a percentage change.
- the control circuit can be designed as an IC, ASIC, and / or microcontroller.
- the control circuit may include a timer / timer and terminate the reduced power operation upon elapse of a time period defined by the timer / timer.
- the length of time may also be adjustable by a user.
- the LED converter has, for example, means to set a corresponding period of time, for example in the form of a turntable, a DIP switch, a slide control, etc.
- a user for example, via a certain start-up sequence defines that first operation with reduced power should be performed.
- the bus may be a DALI or a DSI bus.
- the control circuit may be configured to vary, in particular increase, the power with which the LED route is operated after the time duration, preferably to 100% of a rated power of the LED route and / or a predetermined dimming value.
- the nominal power can be in particular the power with which the lamp is operated without power reduction.
- the dimming value can be stored in a memory in the LED converter and / or transmitted via the bus to the LED converter.
- the LED converter may have a temperature sensor which detects the temperature in / at the LED converter, in particular at the electrolytic capacitor and / or at the actuator / switching regulator.
- a temperature sensor provided for protecting the electrolytic capacitor against overheating can be used for the temperature detection.
- the control circuit may be configured to reduce the period of time for the reduced-power operation depending on an earlier turn-on / turn-off duration of the LED converter and / or from one to the LED converter, e.g. B. on the electrolytic capacitor and / or on the
- Adjust actuator / switching controller detected temperature, wherein the control circuit depends on the duration thereof depends on the memory, in particular a look-up table.
- the parameters influencing the light output of the LED track for the operation of the LED track with reduced power, in particular the time duration, and parameters for the subsequent operation of the LED track can be stored as a dimming profile in the control circuit.
- the duration may be, for example, 5 to 15 seconds, preferably 10 seconds.
- the reduced power preferably corresponds to 5 to 15%, in particular 10% of the rated power of the LED track.
- the LED converter can be designed to operate the LED track at temperatures from -40 ° C to -20 ° C, preferably from temperatures above -25 ° C initially with the reduced power. Overall, the LED converter can be used preferably at temperatures below -25 ° C or -30 ° C.
- the invention provides a method for operating a luminous means, preferably an LED strip with at least one LED, in which the luminous means is operated selectively, in particular as a function of temperature detection or fixed in a low-temperature operating mode Steps: electrical supply of the LED route starting from an electrical supply, in particular a mains voltage or a DC voltage directly or via at least one converter stage via a supply path with at least one electrolytic capacitor, operating the LED track in the operating mode for low temperatures after each switching on the electrical Supply for a predetermined or an adaptive, in particular Temperature-dependent period of time with a reduced performance compared to the rated power, in particular with a certain dimming value, and enabling an operation with unreduced power after the expiration of the time period.
- the invention provides a control circuit, particularly an ASIC or microcontroller, configured to carry out a method as described above or for an LED converter as described above.
- the invention provides a low ambient temperature LED lamp comprising an LED track and an LED converter as described above.
- FIG. 1 schematically shows an exemplary circuit construction for an LED converter according to the invention
- FIG. 2 shows exemplary time profiles for an LED converter according to the invention
- Fig. 4 shows schematically a change in the capacity of the electrolytic capacitor in dependence on the temperature.
- the LED converter which is designed for operation of the LED track at very low temperatures, provides a frost start function (Frosty Start), which can be activated or fixed.
- the LED converter operates an LED path so that after each switching on of an electrical supply of the LED converter for a predetermined time of for example 10 seconds, the LED track is always operated strongly dimmed, for example, with a dimming value of 10% of Rated power of the LED track.
- the term "frost" designates the occurrence of temperatures below 0 ° C.
- a circuit is shown by way of example in FIG. 1, with reference to which the mode of operation of the LED converter is described.
- Fig. 1 shows an LED converter 1 with a rectifier 2, which converts an electrical quantity supplied to the LED converter 1, for example, an AC / AC voltage in a DC / DC voltage.
- the LED converter 1 is supplied by an electrical supply, which already supplies a DC voltage / current.
- an electrolytic capacitor 3 is further connected at the output of the rectifier 2, which is, for example, fed with a mains supply.
- the electrolytic capacitor 3 may be provided elsewhere, and a plurality of electrolytic capacitors may be provided.
- the electrolytic capacitor 3 may also be provided after an actuator or a switching regulator 4, in this case a DC / DC converter, or a constant current source or a PFC circuit.
- the LED converter 1 is used to operate a LED track 5, which may consist of at least one LED.
- a control circuit 6 is also provided, to which an internal or external signal can be supplied, and which sets a parameter influencing the light output of the LED path 5 of the switching regulator 4 (or, for example, the constant current source).
- the control circuit 6 after the expiry of the predetermined time, the switch controller 4 control so that the LED track 5 is operated at a higher power, in particular 100% of their rated power.
- the control circuit for example an IC, ASIC or a microcontroller, etc.
- controls the frost start function ie the heavily dimmed LED operation for the predetermined time each time the LED converter is switched on.
- this frost start function can be programmed in the software of the control unit 6 of the LED converter 1.
- the control unit 6 is therefore preferably designed as an integrated circuit ASIC or as ikrokontroller.
- the electrolytic capacitor 3 In the frost start operation, sufficient power can be provided by the electrolytic capacitor 3 even at low temperatures to operate the LED track 5 in this highly dimmed operation.
- the current flow through the electrolytic capacitor 3 heats the electrolytic capacitor 3. While the electrolytic capacitor 3 is heated at normal temperature to about 60 ° C to 70 ° C, a self-heating of the electrolytic capacitor to about 20 ° C to 30 ° even at the low temperatures mentioned C given.
- the electrolytic capacitor 3 also heats up to a temperature of approximately -25.degree. C., which may thaw out frozen electrolyte and the electrolytic capacitor 3 can provide more power.
- the period of time in which the LED path 5 is operated with reduced power is chosen in particular so that the electrolytic capacitor 3 is sufficiently heated after the expiration of the period, ie in particular has assumed a temperature of -25 ° C.
- an operation with higher power, in particular with 100% nominal power can be set.
- the time duration can be monitored and adjusted by the control circuit 6.
- the control circuit 6 only a timer / timer 8, so that the control circuit after the time period Power changed in response to an internal signal from the timer / timer 8 with which the LED link 5 is operated.
- control circuit 6 can also receive an external signal, for example from a bus, in particular from a DALI / DSI bus, and execute the frost start function depending thereon.
- an external signal for example from a bus, in particular from a DALI / DSI bus
- the control circuit does not receive the signal via the bus, but receives a signal via the supply lines and interpreted accordingly. This variant is not shown in Fig. 1.
- a specific switching sequence and / or a selective rectification of the mains supply could be interpreted to the effect that the time duration is set thereby, or the frost start function is activated / deactivated.
- Such an input can be ⁇ . ⁇ ⁇ . via a (mains) switch or pushbutton.
- the LED converter 1 may further include a temperature sensor 7.
- the temperature sensor 7 can be provided at or in the vicinity of the electrolytic capacitor 3 or the converter 4 and / or the LED track 5. Become several electrolytic capacitors. used, so of course several temperature sensors 7 may be provided. This allows a frost start selectively depending on a temperature detection. In particular, when detecting lower temperatures the specified frost start time can be extended. At higher temperatures, the time can be shortened, or altogether the frost start function can be deactivated. If an external signal can be supplied to the control circuit 6, it is also possible to supply the control circuit with a temperature signal from a temperature detection unit external to the LED converter 1. Thus, the time duration can depend, for example, on an ambient temperature, eg a (global)
- Outdoor temperature sensor can be set.
- a memory may be provided, for example, a look-up table. There it can be deposited, which time duration is to be set when detecting which temperature or for a certain temperature range. Also, with a continuous detection of the temperature, the cold start may be aborted if the sensed temperature is interpreted to mean that the relevant electrolytic capacitor 3 has warmed to a predetermined temperature, for example above -25 ° C.
- a temperature sensor which is intended to prevent heating of the electrolytic capacitor 3 / the LED converter 1 above a threshold addition, for example, to avoid overheating. The evaluation of the detected temperature is modified accordingly in this case in order to realize the frost start function.
- the .Steuerscrien 6 is adjusted accordingly to also evaluate the low temperatures accordingly.
- the LED converter can indeed be designed to enable a dimming operation of LED track 5 in general, ie even after the frost starts. This is not necessary.
- the LED converter 1 may also be a so-called fixed-output device that always operates the LED track at 100% of its rated power. Only one actuator is provided in this case, which allows the strongly dimmed operation, ie the operation with greatly reduced (light) power, after each power-up (power reset) of the electrical supply of the LED converter.
- the frost start can be deactivated. If, for example, the temperature of the electrolytic capacitor 3 detected directly or indirectly is evaluated such that the temperature of the electrolytic capacitor 3 is sufficiently high, the operation can be set immediately to 100% or another dimming value.
- control circuit 6 can also detect a switch-on / off time of the LED converter, for example by means of the timer / timer 8.
- a switch-on time sufficiently long and / or a switch-off sufficient was short, so that due to the time measurement can be assumed that the electrolytic capacitor 3 is still sufficiently heated.
- the memory of the control circuit For example, be stored a table that specifies the length of time as a function of the off period. If, for example, the LED converter has already been switched off for a longer time, the time duration can be selected to be longer, while a short switch-off period may not require a frost start.
- the frost start function of the LED converter 1 is preferred, comparable to a dimming profile, deposited in the control circuit by the manufacturer, or the frost start function is realized by a dimming profile.
- the method mentioned can not be used for example for gas discharge lamps, since too much power is required for starting gas discharge lamps so that they can not be provided by the electrolytic capacitor 3 at the low temperatures. Further, the cold start function can also be done by changing the software / firmware of the control circuit 6.
- FIG. 2 now shows a curve for an LED converter 1 according to the invention.
- the condenser temperature T c in degrees Celsius, an ambient temperature T a (ambient temperature) in degrees Celsius and a dimming value DL (dimming level) in percent are on the vertical axis the nominal power indicated. Also plotted is the equivalent resistance (ESR).
- ESR equivalent resistance
- the time is plotted on the transverse axis. It is shown in FIG. 2 that at the time (1) at a temperature of approximately -30 ° C., the operation of the LED converter 1 with a low dimming value, for example 10% of the nominal power of the LED track 6 (ie in particular 10%). the light output) takes place.
- the electrolytic capacitor 3 now heats up to the time (2) to continuously about -25 ° C.
- the equivalent resistance (ESR) which at the time (1) is still approximately 10 times the equivalent resistance of the electrolytic capacitor 3 at approximately 20 ° C., continuously decreases.
- the power with which the LED sections 5 are to be operated is then increased continuously (fade in, fade to 100%) in a relatively short time until a predetermined light output, in this case 100%, is reached.
- Fig. 3 shows now the course of the equivalent resistance (ESR) for several frequencies (upper curve 100Hz, middle curve lKHz, lower curve lOOKHz) at different temperatures in a temperature range from -40 ° C to about 80 ° C. It can be clearly seen that at a temperature of -40 ° C to -30 ° C the equivalent resistance of the
- Electrolytic capacitor is about ten times higher than at a temperature of 10 ° C to 20 ° C or 60 ° C to 80 ° C.
- Fig. 4 also shows that the capacity of the electrolytic capacitor increases continuously with increasing temperature, and thus at higher temperatures, ie. H. after a self-heating of the electrolytic capacitor 3, a higher power from the LED track 5 can be retrieved or the LED track can be operated by the control circuit 6 with a higher power.
- the invention thus has the advantages that the reduced capacitance and the high equivalent resistance of the electrolytic capacitor 3 at low temperatures ' no problem and the LED track 5, which initially represents a low load for LED converter 1, yet reliably operated can be.
- the temperature ranges in which the LED Converter 1 can be used can be used.
- the costs for producing the LED converter 1 can be lowered or remain the same, since no electrolytic capacitors are specified / specified for temperatures below -25 ° C, -30 ° C and -40 ° C respectively.
- LEDs operate highly efficiently at low temperatures and even have longer lifetimes.
- other bulbs can be operated, which can be started with an initially reduced power, especially in a highly dimmed operation.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012224206.6A DE102012224206B4 (de) | 2012-12-21 | 2012-12-21 | LED-Konverter mit Froststart-Funktion |
| PCT/AT2013/000204 WO2014094010A2 (de) | 2012-12-21 | 2013-12-19 | Led-konverter mit froststart -punktion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2936929A2 true EP2936929A2 (de) | 2015-10-28 |
| EP2936929B1 EP2936929B1 (de) | 2020-03-25 |
Family
ID=50336009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13838083.7A Active EP2936929B1 (de) | 2012-12-21 | 2013-12-19 | Led-konverter mit froststart-funktion |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2936929B1 (de) |
| CN (1) | CN105075394B (de) |
| AT (1) | AT15400U1 (de) |
| DE (1) | DE102012224206B4 (de) |
| WO (1) | WO2014094010A2 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220264719A1 (en) * | 2021-02-12 | 2022-08-18 | Analog Devices International Unlimited Company | Stochastic frequency pulse modulation for light-emitting diode drivers |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105813334A (zh) * | 2014-12-31 | 2016-07-27 | 广州励丰文化科技股份有限公司 | 基于区域功率供电的剧场灯光供电管理方法及系统 |
| GB2547743B (en) * | 2015-12-09 | 2020-02-19 | Thales Holdings Uk Plc | Preheating for laser diode drivers |
| CN105763035B (zh) * | 2016-04-11 | 2018-06-29 | 广州金升阳科技有限公司 | 一种提高低温启动能力的方法及电路 |
| AT15439U1 (de) | 2016-05-20 | 2017-09-15 | Tridonic Gmbh & Co Kg | Elektrisches Vorschaltgerät mit Extremtemperaturschutz |
| NL2023562B1 (en) | 2019-07-24 | 2021-02-10 | Eldolab Holding Bv | Smart starting up method by an LED driver |
| CN114977113A (zh) * | 2022-06-13 | 2022-08-30 | 北京迪赛奇正科技有限公司 | Ac-dc变换器控制方法以及装置 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006056057A1 (de) * | 2006-02-28 | 2007-09-06 | Samsung Electro - Mechanics Co., Ltd., Suwon | Antriebsvorrichtung für ein farbiges LED-Hintergrundlicht |
| DE102009014998A1 (de) | 2009-03-26 | 2010-09-30 | Tridonicatco Gmbh & Co. Kg | Dimmbares Betriebsgerät und Beleuchtungssystem zur Erhöhung der Lebenserwartung bei LEDs und OLEDs |
| EP2494853A4 (de) * | 2009-08-20 | 2013-11-06 | Univ City Hong Kong | Vorrichtung und verfahren für den betrieb einer passiven und aktiven led-beleuchtungsausrüstung |
| DE102010006998A1 (de) * | 2010-02-05 | 2011-08-11 | Siteco Beleuchtungstechnik GmbH, 83301 | Temperaturkompensation des Lichtstroms an LED-Leuchten |
| US8299715B2 (en) * | 2010-05-28 | 2012-10-30 | Omnipulse Technology Corporation | Temperature compensated driver for pulsed diode light source |
| JP5501124B2 (ja) | 2010-07-05 | 2014-05-21 | 三菱電機株式会社 | 点灯装置および照明装置 |
| JP5925425B2 (ja) | 2011-04-07 | 2016-05-25 | サンデンホールディングス株式会社 | インバータ装置 |
| JP2013065528A (ja) | 2011-09-20 | 2013-04-11 | Toshiba Lighting & Technology Corp | Led点灯装置およびled照明装置 |
-
2012
- 2012-12-21 DE DE102012224206.6A patent/DE102012224206B4/de active Active
-
2013
- 2013-12-19 WO PCT/AT2013/000204 patent/WO2014094010A2/de not_active Ceased
- 2013-12-19 EP EP13838083.7A patent/EP2936929B1/de active Active
- 2013-12-19 CN CN201380073678.6A patent/CN105075394B/zh not_active Expired - Fee Related
- 2013-12-19 AT ATGM9018/2013U patent/AT15400U1/de not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014094010A2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220264719A1 (en) * | 2021-02-12 | 2022-08-18 | Analog Devices International Unlimited Company | Stochastic frequency pulse modulation for light-emitting diode drivers |
| US11564296B2 (en) * | 2021-02-12 | 2023-01-24 | Analog Devices International Unlimited Company | Stochastic frequency pulse modulation for light-emitting diode drivers |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105075394B (zh) | 2017-07-21 |
| CN105075394A (zh) | 2015-11-18 |
| AT15400U1 (de) | 2017-08-15 |
| WO2014094010A2 (de) | 2014-06-26 |
| WO2014094010A3 (de) | 2014-08-28 |
| DE102012224206A1 (de) | 2014-06-26 |
| EP2936929B1 (de) | 2020-03-25 |
| DE102012224206B4 (de) | 2024-09-12 |
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