Led converter having a frost start function
A technology of converters and LED light strings, applied in lighting devices, light sources, electrical components, etc., can solve problems such as electrolyte freezing, inability to operate in external areas, and inability to start LED light strings
Active Publication Date: 2015-11-18
TRIDONIC
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Problems solved by technology
[0003] However, the following problems arise in the use of such LED converters. In use, it cannot be used at low temperatures, such as in a refrigerator / freezer, refrigerator / freezer or refrigerator / freezer, and it cannot be used in an external area, that is, generally in a refrigerator / freezer. Guarantee the operation of LED light strings in environments with low temperatures such as below -30°C or -25°C
[0004] The basis for this is that at such low temperatures, in particular below -25°C, the electrolytic capacitors of the LED converters cannot provide sufficient electrical power for starting the LED light string, since part of the electrolyte of the electrolytic capacitors may freeze
[0005] On the other hand, at such low temperatures, the internal resistance of electrolytic capacitors also increases significantly
Therefore, especially when the LED light string should be operated at 100% of its rated power, there is the danger that starting of the LED light string cannot be achieved
[0006] Although it is possible to use electrolytic capacitors specially designed for operation at low temperatures such as below -40°C, these electrolytic capacitors are much more expensive than the electrolytic capacitors used according to the standard, thus significantly increasing the cost of the LED converter overall
Moreover, such LED converters must be specially fabricated
Method used
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[0031] Now, the invention provides that LED converters designed for operating LED light strings at very low temperatures provide a frost start function (frost start), which is activatable or fixedly set. In particular, the LED converter operates an LED lamp string in such a way that the LED lamp string will always be operated at extremely dim brightness within a predetermined time, for example 10 seconds, after each switching on of the power supply of the LED converter, For example, a dimming value of 10% of the rated power of the LED light string is used. In this case, the frost start function refers to the mode of operation for low temperatures, wherein the term "frost" usually refers to the occurrence of temperatures below 0°C.
[0032] figure 1 A circuit is exemplarily shown in , and the working principle of the LED converter will be described below in conjunction with this circuit.
[0033] in, figure 1 The LED converter 1 is shown with a rectifier 2 which converts the...
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The invention relates to an LED converter which in a first embodiment is designed to operate selectively at least one LED series or other lamps having at least one LED, in particular dependent on a temperature detection or fixed in an operating mode for low temperatures, comprising: at least one electrolytic capacitor in an electrical supply path via which, starting from an electrical supply, in particular a main voltage or a direct current, the LED series can be supplied directly or via at least one converter stage, and a control circuit that is designed, to operate the LED series in the operating mode for low temperatures every time the electrical supply is switched on, for a predetermined period of time or for a period of time that is adaptive, in particular temperature-dependent, at a reduced capacity compared with the nominal capacity, in particular at a specific dimmed value, and after expiry of the period of time to allow the operation at non-reduced capacity.
Description
technical field [0001] The invention relates to an LED converter for operating an LED light string and a method for operating such an LED light string. The method relates in particular to LED converters with electrolytic capacitors (ELKO, ELCAP). Background technique [0002] LED converters for operating LED lighting strings are known, in particular LED converters in which an ELKO is provided, for example after a mains filter and / or a rectifier or in the supply path of the LED lighting string. [0003] However, the following problems arise in the use of such LED converters. In use, it cannot be used at low temperatures, such as in a refrigerator / freezer, refrigerator / freezer or refrigerator / freezer, and it cannot be used in an external area, that is, generally in a refrigerator / freezer. The operation of the LED light string is guaranteed in an environment with a low temperature such as below -30°C or -25°C. [0004] The basis for this is that at such low temperatures, in p...
Claims
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IPC IPC(8): H05B33/00H05B33/08H05B44/00
CPCH05B33/0854H05B45/18
InventorF·朗格勒
OwnerTRIDONIC