• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a first aspect, the invention provides an LED converter (1) which is adapted to selectively control at least one LED path (5) or other lighting means with at least one LED, in particular depending on a temperature detection or permanently set in an operating mode for to operate at low temperatures, comprising: at least one electrolytic capacitor (3) in an electrical supply path via which the LED path (5) can be supplied directly from an electrical supply, in particular a mains voltage or a DC voltage or via at least one converter stage, and a Control circuit (6), which is adapted to the LED track (5) in the operating mode for low temperatures after each switching on the electrical supply for a predetermined or an adaptive, especially temperature-dependent period of time with a reduced power compared to the rated power, in particular a certain dimming value, operate, and after expiration of the period of time to release the operation with unreduced power, wherein for the temperature detection in / on the LED converter (1), a temperature sensor (7) is provided.
    公开号:AT15400U1
    申请号:TGM9018/2013U
    申请日:2013-12-19
    公开日:2017-08-15
    发明作者:Längle Fabian
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    LED CONVERTER WITH FROSTED FUNCTION
    The invention relates to an LED converter for operating an LED track and a method for operating such a LED track. In particular, the method relates to an LED converter with electrolytic capacitor (ELKO, ELCAP).
    LED converter for the operation of LED circuits are well known, especially LED converter, in which a ELKO, for example, after a line filter and / or a rectifier, or in the supply path of the LED track is provided.
    When using such a LED converter, however, the problem arises that when used at low temperatures, for example in refrigeration / freezing houses, refrigerators / freezers or cabinets, but also in outdoor areas, d. H. Generally in low temperature environments, for example below -30 ° C or -25 ° C, operation of the LED track can not be guaranteed.
    The reason for this is that at such low temperatures, especially below -25 ° C, the electrolytic capacitor of the LED converter can not provide enough electrical power for the start-up of the LED track, since part of the electrolyte of the electrolytic capacitor can be frozen ,
    On the other hand, at such low temperatures, the internal resistance of the electrolytic capacitor increases sharply. Thus, especially if the LED track is to be operated at 100% of its rated power, there is the danger that the activation of the LED track can not take place.
    Although it is possible to use electrolytic capacitors, which are specified for operation at low temperatures, for example for temperatures below -40 ^. However, these electrolytic capacitors are much more expensive compared to the electrolytic capacitors used as standard, so that the total cost of the LED converter would greatly increase. Furthermore, such LED converter would have to be made specifically.
    The document WO 2010/108982 A1 is known from the prior art. This document describes a one-time restriction of dimming values during a burn-in process of gas discharge lamps when a converter is first started up for a certain period of time.
    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.
    In a first aspect, the invention provides an LED converter adapted to selectively control at least one LED track or other lighting means having at least one LED, in particular depending on a temperature sensing, or fixed in a low temperature operating mode to operate. The LED converter has: a connection for a voltage supply, in particular an AC supply such as, for example, a mains voltage, at least one electrolytic capacitor in an electrical supply path, via which the LED path starts from one of the connectable power 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, in particular temperature-dependent period of time with a comparison to operate with the rated power reduced power, in particular with a certain dimming value, and release after the period of time to operate with unreduced power.
    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 fed to 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. In this case, 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. However, the signal may also signal a change in power relative to the current or predetermined power, e.g. a percentage change.
    The control circuit may be configured as an IC, ASIC, and / or microcontroller.
    The control circuit may include a timer / timer and terminate the operation with reduced power after the expiry of a time period defined by the timer / timer. The length of time may also be adjustable by a user. For this purpose, it can be provided that 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. It can also be provided that a user, for example, via a certain start-up sequence defines that first operation with reduced power should be performed.
    In particular, the bus may be a DALI or a DSI bus.
    The control circuit may be adapted to change, in particular to increase, in particular, preferably to 100% of a rated power of the LED track and / or a predetermined dimming value after the period of time the power with which the LED track is operated. 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.
    Further, the LED converter may have a temperature sensor which detects the temperature in / on the LED converter, in particular on the electrolytic capacitor and / or on the actuator / switching regulator. In particular, a temperature sensor provided for protecting the electrolytic capacitor against overheating can be used for the temperature detection.
    The control circuit may be adapted to the period of time for the operation with reduced power depending on an earlier on / off duration of the LED converter and / or from one to the LED converter, for. B. adjusted to the electrolytic capacitor and / or to the actuator / switching regulator 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 parameters 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 period of time 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 ^ to -20 ^, preferably from temperatures above -25 ° C initially with the reduced power. Overall, the LED converter can be used preferably at temperatures below -25 ^ or -30 ° C.
    In a further aspect, the invention provides a method for operating a light source, preferably an LED track with at least one LED, in which the light source is operated selectively, in particular depending on a temperature detection or fixed in a mode for low temperatures comprising the steps of: electrically sourcing the LED link 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 path in the low temperature mode after each Switching on the electrical supply for a predetermined or an adaptive, especially 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 Ablau f the duration.
    In yet another aspect, the invention provides a control circuit, in particular ASIC or microcontroller, adapted for carrying out a method as described above or for an LED converter as described above.
    In yet another aspect, the invention provides a low ambient temperature LED lamp comprising an LED track and an LED converter as described above.
    The invention and further aspects of the invention will now be shown with reference to the figures. 1 schematically shows an exemplary circuit configuration for an LED converter according to the invention, FIG. 2 shows exemplary time profile curves for an LED converter according to the invention, [0029] FIG. 3 shows an exemplary curve of an equivalent resistance (ESR, Equiva lent Series Resistor) in relation to temperature, and Fig. 4 shows schematically a change in the capacitance of the electrolytic capacitor in
    Dependence on temperature.
    The invention now provides that the LED converter, which is designed for the operation of the LED track at very low temperatures, a frost start function (Frosty Start) provides that can be activated or fixed. In particular, the LED converter operates an LED path so that after each switching on 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 frost-start function is a low-temperature operating mode, where the term "frost" generally refers to the occurrence of temperatures below 0 ° C.
    In Fig. 1, a circuit is shown by way of example, based on the operation of the LED converter will be described below.
    FIG. 1 shows an LED converter 1 with a rectifier 2, which has an electrical quantity supplied to the LED converter 1, e.g. converts an AC / AC voltage to a DC / DC voltage. However, it can also be provided that the LED converter 1 is supplied by an electrical supply, which already supplies a DC voltage / a direct current.
    In the schematic representation, an electrolytic capacitor 3 is further connected at the output of the example, mains-powered rectifier 2. However, in the LED converter, the electrolytic capacitor 3 may be provided elsewhere, and a plurality of electrolytic capacitors may be provided. In particular, 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.
    Overall, the LED converter 1 is used to operate a LED track 5, which may consist of at least one LED. Typically, there is also provided a control circuit 6, to which an internal or external signal can be applied, and which adjusts a parameter of the switching regulator 4 (or, for example, the constant current source) which influences the light output of the LED path 5.
    In particular, 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. It is therefore contemplated that the control circuitry (eg, an IC, ASIC, or a microcontroller, etc.) controls the frost start function, i. H. the strongly dimmed LED operation for the specified time each time the LED converter is switched on. In particular, 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 a microcontroller.
    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. In addition, 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'O even at the low temperatures mentioned a self-heating of the electrolytic capacitor to about 20 ° C to 30 ° C given.
    Thus, the electrolytic capacitor 3 is also heated in the highly dimmed operation above a temperature of about - 25 ° C, which may thaw frozen electrolyte and the electrolytic capacitor 3 can provide more power.
    The period of time in which the LED track 5 is operated with reduced power, is therefore 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 about -25 ^. Thus, after expiration of the predetermined time, then an operation with higher power, in particular with 100% nominal power can be set.
    In general, the time duration can be monitored and adjusted by the control circuit 6. In the simplest case, the control circuit 6 only has a timer / timer 8, so that the control circuit after the period of time changes the power to an internal signal from the timer / timer 8, with which the LED track 5 is operated.
    However, the control circuit 6 can also receive an external signal, for example from a bus, in particular from a DALI / DSI bus, and depending on the frost start function execute. In particular, provision can be made to activate / deactivate the frost start function by means of an external signal, or to set the time duration for the operation with reduced power. Further, it may be provided that 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. Thus, for example, 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 may e.g. 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. If several electrolytic capacitors are used, it goes without saying that a plurality of temperature sensors 7 can also be provided. This allows a frost start selectively depending on a temperature detection. In particular, when detecting lower temperatures, the predetermined frost start time can be extended. At higher temperatures, the time can be shortened, or altogether the frost start function can be deactivated.
    If the control circuit 6, an external signal to be supplied, it is also possible to supply the control circuit with a temperature signal from an external to the LED converter 1 temperature detection unit. Thus, for example, the time duration may depend on an ambient temperature, e.g. a (global) outdoor temperature sensor.
    In the control circuit 6, 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, in a continuous detection of the temperature of the cold start can be stopped when the detected temperature is interpreted to the effect that the relevant electrolytic capacitor 3 has heated to a predetermined temperature, for example above -25 ° C. For temperature detection can of course also be used 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. Preferably, the control circuit 6 is adapted accordingly to evaluate the low temperatures accordingly.
    Further, it should be understood that while the LED converter may be configured to be generally, i. even after the frost start, a dimming operation LED range 5 to allow. This is not necessary. In particular, 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 to be provided in this case, the strongly dimmed operation, d. H. operation with greatly reduced (light) power, after each power-up (power reset) of the power supply of the LED converter allowed.
    If it is concluded from the detected temperature that the temperature at the electrolytic capacitor 3 is sufficiently high, 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.
    However, the control circuit 6 may also detect an ON / OFF period of the LED converter, e.g. with the aid of the timer / timer 8. Thus, in the sense of a time measurement by the control circuit 6, for example, be detected whether a switch-on time sufficiently long and / or a switch-off was sufficiently short, so that it can be assumed that the electrolytic capacitor 3 due to the time measurement is still sufficiently heated. Thus, for example, a table can also be stored in the memory of the control circuit, which predetermines the time duration as a function of the switch-off time duration. 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.
    It should be noted that said method can not be used, for example, for gas discharge lamps since gas discharge lamps require too much power to start, 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.
    When using a plurality of electrolytic capacitors 3, a temperature sensor 7 can also be provided per electrolytic capacitor, and the temperature at the electrolytic capacitors can be detected individually. The duration of the frost start function may then be e.g. depending on a detected maximum / minimum temperature value or an average value of the detected temperatures.
    FIG. 2 now shows a curve for an LED converter 1 according to the invention. The condenser temperature Tc in degrees Celsius, an ambient temperature Ta (ambient temperature) in degrees Celsius and a dimming value DL (dimming level) in FIG Percent of rated power stated. Also plotted is the equivalent resistance (ESR). The time is plotted on the transverse axis.
    Shown in Fig. 2, that at the time (1) at a temperature of about -30Ό the operation of the LED converter 1 with a low dimming value, for example, 10% of the rated power of the LED track 6 (ie in particular 10th % of the light output).
    The electrolytic capacitor 3 now heats up to the time (2) to continuously about -25 ° C. At the same time, it can be seen that 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.
    At time (2), i. E. After the period of time, 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.
    Furthermore, it can be seen at the time (3) that the temperature of the electrolytic capacitor 3 has increased steadily and the equivalent resistance is considerably lower and moves in the direction of the equivalent resistance by a factor of one. At the time (3), the operating temperature of the electrolytic capacitor 3 is thus reached and the capacity of the electrolytic capacitor 3 and its equivalent resistance normalize.
    Fig. 3 shows now the course of the equivalent resistance (ESR) for several frequencies (upper curve 100Hz, middle curve 1KHz, lower curve 100KHz) at different temperatures in a temperature range from -40 ^ 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.
    Overall, the invention thus has the advantages that the reduced capacitance and the high equivalent resistance of the electrolytic capacitor 3 at low temperatures is not a problem and the LED track 5, which is initially a small load for LED converter 1, yet can be operated reliably. In addition, can be increased by the inventive method and the converter according to the invention, the temperature ranges in which the LED converter 1 can be used. Thus, in particular, the cost of producing the LED converter 1 can be lowered or remain the same, since no electrolytic capacitors are specified / specified for temperatures below -25 ^, -30 ° C or -40 ^.
    In addition, it is advantageous that LEDs work very efficiently at low temperatures and even have longer lifetimes. In addition to LEDs, however, other bulbs can be operated, which can be started with an initially reduced power, especially in a highly dimmed operation.
    权利要求:
    Claims (15)
    [1]
    claims
    An LED converter which is adapted to operate at least one LED path or other light-emitting means selectively, in particular depending on a temperature detection or fixedly set in a operating mode for low temperatures, comprising: at least one electrolytic capacitor in an electrical supply path, via which the LED path can be supplied from an electrical supply, in particular a mains voltage or a DC voltage directly or via at least one converter stage, and - a control circuit which is adapted to operate the LED path in the operating mode for low temperatures after each switch-on the electrical supply for a predetermined or an adaptive, especially temperature-dependent period of time with a reduced power compared to a rated power, in particular with a certain dimming value, and after the period of time to release the operation with unreduced power, characterized g ekennzeichnet that the LED converter (1) further comprises a temperature sensor (7) which detects the temperature in / on the LED converter (1), in particular on the electrolytic capacitor (3) and / or on the actuator / switching regulator, and wherein, in particular, a temperature sensor (7) provided for protecting the electrolytic capacitor (3) against overheating is used for the temperature detection.
    [2]
    2. LED converter according to claim 1, wherein the electrolytic capacitor (3) is supplied starting from an actuator / switching regulator, in particular a DC-DC converter and / or a constant current source.
    [3]
    3. LED converter according to claim 1 or 2, wherein the control circuit (6) is a signal feed-bar, in particular via a bus connectable thereto, which indicates at least an amount and / or the duration of the power reduction, and wherein the control circuit (6 ) adjusts the light output of the LED path (5) influencing parameters, in particular operating parameters of the switching regulator or the constant current source, preferably depending on the signal.
    [4]
    4. LED converter according to one of the preceding claims, wherein the control circuit (6) is designed as an IC, ASIC, and / or microcontroller.
    [5]
    5. LED converter according to one of the preceding claims, wherein the control circuit (6) has a timer / timer (8) and the operation with reduced power after the expiry of a timer / timer (8) defined period ends, and / or the time period is adjustable by a user.
    [6]
    6. LED converter according to claim 3, wherein the bus is a DALI bus or a DSI bus.
    [7]
    7. LED converter according to one of the preceding claims, wherein the control circuit (6) is adapted to change after the time period, the power with which the LED strip (5) is operated, in particular, preferably to 100% of a Rated power of the LED track (5) and / or to another dimming value, and wherein the other dimming value is stored in a memory of the LED converter (1) and / or transmitted via the bus to the LED converter (1).
    [8]
    8. LED converter according to claim 7, wherein the control circuit (6) is adapted to enable the unreduced power for the operation with the reduced power depending on a previous on / off duration of the LED converter (1) and / or of a in the LED converter (1), on the electrolytic capacitor (3) and / or on the actuator / switching regulator detected temperature set, the control circuit (6) depending on the time duration thereof via the memory, in particular a look-up table set.
    [9]
    9. LED converter according to claim 7, wherein the light output of the LED track (5) influencing parameters, in particular the duration, and parameters for the subsequent operation of the LED track in the memory, preferably as a dimming profile, in the control circuit (6) are deposited.
    [10]
    10. LED converter according to one of the preceding claims, wherein the time is 5-15 seconds, preferably 10 seconds.
    [11]
    11. LED converter according to one of the preceding claims, wherein the reduced power corresponds to 5-15%, preferably 10%, the rated power, in particular 100% power of the LED track.
    [12]
    12. LED converter according to one of the preceding claims, wherein the control circuit (6) is adapted to the LED track (5) at temperatures below -30 ° C - - 20 ° C, preferably at temperatures below -25 ^ to initially operate with the reduced power.
    [13]
    13. A method of operating a light source, preferably an LED track with at least one LED, selectively, in particular dependent on a temperature detection or fixed in a low temperature operating mode, comprising the steps of: - electrically supplying the LED track 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 path in the operating mode for low temperatures after each switching on the electrical supply for a predetermined or an adaptive, especially temperature-dependent period of time with a power reduced in comparison to a rated power, in particular with a specific dimming value, and - releasing an operation with unreduced power after the expiration of the time duration, and - detecting the temperature by means of a temperature sensor in / on the L ED converter, in particular to the electrolytic capacitor and / or to the actuator / switching regulator, and wherein in particular a provided for the protection of the electrolytic capacitor against overheating temperature sensor is used for the temperature detection.
    [14]
    14. Control circuit, in particular ASIC or microcontroller, which is designed for carrying out a method according to claim 13 or for an LED converter according to one of claims 1 to 12.
    [15]
    15. LED light for low ambient temperatures, comprising an LED track (5) and an LED converter (1) according to one of claims 1 to 12.
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    引用文献:
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    法律状态:
    2021-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20201231 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102012224206.6A|DE102012224206A1|2012-12-21|2012-12-21|LED converter with frost start function|
    PCT/AT2013/000204|WO2014094010A2|2012-12-21|2013-12-19|Led converter having a frost start function|
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