LED lighting module
AssigneeSignify Holding B.V.
InventorsMarcel Beij, Bertrand Johan Edward Hontele, Patrick Alouisius Martina De Bruycker, Dmytro Viktorovych Malyna, Dalibor Cvoric
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Abstract
The invention describes an LED lighting module (1) comprising input terminals (13hi, 13lo) for connecting to an input voltage (Uin); an LED load (10) realized to operate at an upper threshold voltage level (Vdim); and a regulation circuit (11, 12) realized to decrease LED current (ILED) through the LED load (10) when the input voltage (Uin) is greater than the upper threshold voltage level (Vdim). The invention further describes an LED lighting arrangement (4) and a method of driving an LED load (10).
Claims13
An LED lighting module comprising:
- a plurality of input terminals for connecting to an input voltage;
- an LED load realised to operate at an upper threshold voltage level and arranged in series with a first semiconductor switch and a current sense resistor;
- and
- a regulation circuit comprising a current control circuit to regulate LED current and a voltage monitor circuit to generate a variable input to the current control circuit, wherein the regulation circuit is realised to decrease LED current through the LED load when the input voltage is greater than the upper threshold voltage level,
- wherein the current control circuit comprises a reference input and a variable input, the current control circuit being realized to regulate LED current through the first semiconductor switch according to a difference between the reference input and the variable input, and
- wherein the voltage monitor circuit generates the variable input to the current control circuit based at least in part on the input voltage applied to the LED lighting module and the upper threshold voltage level.
A method of driving an LED load of a LED lighting module, the LED load realised to operate at an upper threshold voltage level, which method comprises the steps of
- connecting, with a plurality of input terminals, the LED lighting module to an input voltage, and further connecting the LED load in series with a first semiconductor switch and a current sense resistor;
- generating, with a voltage monitor circuit, a variable input to a current control circuit based on the input voltage applied to the LED lighting module and the upper threshold voltage level;
- regulating, with the current control circuit, LED current through the first semiconductor switch according to a difference between a reference input and the variable input;
- and
- regulating, with a regulation circuit comprising the current control circuit and the voltage monitor circuit, the LED current such that the LED current through the LED load decreases when the input voltage is greater than the upper threshold voltage level.
Dependencies are inferred from the claim text.