CIRCUIT ASSEMBLY FOR OPERATING AT LEAST A FIRST AND A SECOND CASCADE OF LEDS
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United States of America Patent
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Issued Date -
Sep 8, 2016
app pub date -
Sep 24, 2014
filing date -
Oct 31, 2013
priority date (Note) -
Abandoned
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Abstract
A circuit assembly for operating at least a first and a second cascade of LEDs is disclosed. The LED cascades have a different number of LEDs. The LED cascades are operated in alternation by means of a suitable control logic, the operation being adapted to the instantaneous value of the rectified alternating supply voltage. The LED cascades are associated with LED units, wherein each LED unit includes a control device for controlling the particular LED cascade. The LED units are coupled in series between the two input connections, wherein the input connections are formed by the output of a rectifier. A linear controller is provided in series with the LED cascades, which linear controller is controlled via a voltage divider, which is coupled between the two input connections. For adaptation to different alternating supply voltages, a switching device is associated with at least the highest LED cascade.
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