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US 2003/0117087 A1Published application
Drive circuit for light-emitting diodes
AssigneeTridonicAtco GmbH & Co. KG
InventorsAlexander Barth, Peter Hein, Werner Ludorf
Life of this patent
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Abstract
The invention relates to a control circuit for at least one light-emitting diode (1) for adjusting the current and/or the voltage of the light-emitting diode (1) to a desired value adjusted by means of a controller (3), the current, the voltage and/or the luminescence of the light-emitting diode (1) being detectable and comparable with the desired value.
Claims22
A drive circuit for at least one light-emitting diode, said circuit comprising:
- a switched-mode regulator that can be supplied with a direct input voltage to drive said at least one light-emitting diode;
- means for determining current through a light-emitting diode connected to said drive circuit and for determining the voltage across such light-emitting diode;
- a regulating device to which a current setpoint value and a voltage setpoint value are fed and to which signals representative of the determined current and the determined voltage at the light-emitting diode are supplied, said regulating device being constructed to regulate the current and the voltage supplied to the light-emitting diode according to the respective setpoint values;
- and
- a controller arranged for adjusting the setpoint values.
2 more elements
Dependencies are inferred from the claim text.