Led lighting fixture with one set of intensity of light
AssigneeArtemide S.p.A.
InventorDanilo CORRADI
Life of this patent
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Abstract
A LED lighting apparatus includes at least one LED lighting element, a control unit and a switching converter, for supplying the LED lighting element. A feedback circuit is connected between the LED lighting element and a ground line and co-operates with the switching converter for determining a LED current through LED lighting element. The feedback circuit has a first impedance in a first state, to which a non-zero first regulation value of the LED current corresponds, and a second impedance in a second state, to which a non-zero second regulation value of the LED current corresponds. The control unit is configured to cyclically switch the feedback circuit between the first state and the second state with a controllable duty-cycle.
Claims11
Lighting apparatus comprising:
- at least one LED lighting element;
- a control unit;
- a switching converter, having a supply input, connectable to a supply line for receiving an input supply voltage (VA), and an output for supplying the LED lighting element;
- a feedback circuit, connected between a terminal of the LED lighting element and a constant potential line and co-operating with the switching converter for determining a LED current (IL) through LED lighting element;
- characterized in that the feedback circuit has a first impedance (R1) in a first state, to which a non-zero first regulation value (IL1) of the LED current (IL) corresponds, and a second impedance (R2) in a second state, to which a non-zero second regulation value (IL2) of the LED current (IL) corresponds, and wherein the control unit is configured to cyclically switch the feedback circuit between the first state and the second state with a controllable duty-cycle.
Dependencies are inferred from the claim text.