Circuit for the operation of at least one LED

摘要

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 a control circuit for clocking the switch. The control circuit is in the form of an integrated circuit (IC) and is provided with input and output pins. The 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.”

主权项

1. A driver circuit for at least one LED, the driver circuit comprising:
input terminals to be connected to an input or operating voltage in the form of a direct current (DC) voltage or a rectified alternating (AC) voltage, output terminals to be connected to a load circuit, said load circuit containing the at least one LED, an inductor, a clocked switch, a control circuit for clocking the switch, said control circuit comprising an integrated circuit (IC) having input and output pins, wherein the control circuit generates a clock signal for the switch based on at least two actual value signals, wherein the two actual value signals are associated with different switching phases of the switch, wherein the inductor is connected in such a way that it is charged in one switching phase of the switch and is discharged in another switching phase, and wherein a current is driven through the load circuit, at least in the other switching phase, such that the two actual value signals are tapped off in different time periods or at different times, but at a common measurement point in the driver circuit.