Circuit for the operation of at least one LED
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United States of America Patent
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Jul 9, 2013
Grant Date -
Oct 20, 2011
app pub date -
Oct 15, 2009
filing date -
Oct 22, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit for operating at least one LED (“driver circuit”) includes input terminals to be connected to an input or operating voltage in the form of a direct current (DC) voltage or a rectified alternating current (AC) voltage, and output terminals to be connected to a load circuit containing the at least one LED. The circuit includes a clocked switch and an open-loop control circuit for clocking the switch. The open-loop control circuit is in the form of an integrated circuit (IC) and is provided with input and output pins. The open-loop control circuit generates a clock signal for the switch depending on at least two actual value signals, such that there is a control loop with the manipulated variable “clocking of the switch.”
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