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AssigneeDiehl Aerospace GmbH
InventorsUwe NIEBERLEIN, Stefan DOBLER, Guenther KOENINGER
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It is the task of the present invention to provide an LED lighting device that is adapted for an AC voltage supply. Suggested for this is an LED lighting device 1 for an AC voltage supply 2, with several LEDs that form a whole chain 9, whereby the LEDs are divided into LED part groups 11a, b, c, whereby a supply voltage with changing amplitude is present in the LED lighting device 1, whereby several LED part groups 11a, b, c are arranged in series with each other and form an LED strand 8, 8a, b, c, and with shorting links 12a, b, c, each designed for bridging one of the LED part groups 11a, b, c in the LED strand 8, 8a, b, c, and with a control means 10, whereby the control means 10 is designed for controlling the shorting links 12a, b, c in order to place the LED strand 8, 8a, b, c in at least two switch states I, II, whereby the at least two switch states I, II differ in the through voltage of the LED strand 8, 8a, b, c.
LED lighting device (1) for AC voltage supply (2),
LED lighting device (1) according to one of the preceding claims, characterised in that the control means (10) is designed for random access to the shorting links (12a, b, c) of the LED strand (8, 8a, b, c).
LED lighting device (1) according to one of the preceding claims, characterised in that the control means (10) is designed for controlling the shorting links (12a, b, c) in order to place the LED strand (8, 8a, b, c) in several variants of a switch state (I, II), whereby the variants comprise the same through voltage of the LED strands (8, 8a, b, c), but a different selection of bridged LED part groups (11a, b, c).
LED lighting device (1) according to one of the preceding claims, characterised in that the waveform of the supply voltage is formed by a repeating wave section (12), whereby the different switch states (I, II, Ill) are taken up during the wave section (13).
LED lighting device (1) according to one of the preceding claims, characterised by a current sink (7) switched in series with the whole chain (9), to which a supply voltage and a supply current is applied, whereby the current sink (7) is designed to control the chain current for the whole chain (9), so that the time curve of the supply current is synchronised with the time curve of the supply voltage or the time curve of a mains voltage of the AC voltage supply (2).
LED lighting device (1) according to one of the preceding claims, characterised in that the whole chain (9) comprises several such LED strands (8a, b, c), whereby the LED strands (8a, b, c) are switched electrically parallel with each other.
LED lighting device (1) according to one of the preceding claims, characterised in that each one of the LED strands (8, 8a, b, c) comprises an accumulative switching means (15a, b, c), whereby the accumulative switching means (15a, b, c) is switched in electrical series with the LED part groups (11a, b, c) in the associated LED strand (8a, b, c).
Method for operating the LED lighting device (1) according to one of the preceding claims, characterised in that the control means (10) change the switch state (I, II, III) of the whole chain (9) depending on the amplitude of the supply voltage.
Dependencies are inferred from the claim text.