Supply assembly for a led lighting module
First Claim
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1. A supply assembly for a LED lighting module comprising:
- a direct current (DC) voltage source having a first and a second supply terminal;
a switched-mode converter connected to said first and second supply terminals for supplying power to an LED lighting module connectable to said converter, said converter comprising a controllable switch coupled to at least one of said first and second supply terminals for switchably connecting said DC voltage source; and
a controller for controlling the switching of the controllable switch, said controller having means for supplying a dual pulse-width modulated switching signal to said controllable switch at two frequencies including a high frequency pulse-width modulated switching signal component for controlling a magnitude of an LED current in said LED lighting module, and a low frequency pulse-width modulated switching signal component for controlling a duration of the LED current.
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Abstract
A supply assembly for an LED lighting module includes a control switch for supplying a constant current to the LED lighting module. A dual switching signal composed of low frequency bursts of high frequency pulses is applied to the control switch. By varying the low frequency component of the dual switching signal, the average current through the LED lighting module may be varied in order to vary the light intensity outputted by the LED lighting module.
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Citations
6 Claims
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1. A supply assembly for a LED lighting module comprising:
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a direct current (DC) voltage source having a first and a second supply terminal;
a switched-mode converter connected to said first and second supply terminals for supplying power to an LED lighting module connectable to said converter, said converter comprising a controllable switch coupled to at least one of said first and second supply terminals for switchably connecting said DC voltage source; and
a controller for controlling the switching of the controllable switch, said controller having means for supplying a dual pulse-width modulated switching signal to said controllable switch at two frequencies including a high frequency pulse-width modulated switching signal component for controlling a magnitude of an LED current in said LED lighting module, and a low frequency pulse-width modulated switching signal component for controlling a duration of the LED current.
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2. A supply assembly for a LED lighting module comprising:
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a direct current (DC) voltage source having a first and a second supply terminal;
a series arrangement of a diode and a controllable switch connected across the first and second supply terminals of the DC voltage source;
an inductor connecting the first supply terminal of the DC voltage source to an first output terminal, a node between the diode and the controllable switch forming a second output terminal, said LED lighting module being connectable between the first and second output terminals; and
a controller for controlling the switching of the controllable switch, said controller having means for supplying a dual pulse-width modulated switching signal to said controllable switch at two frequencies including a high frequency pulse-width modulated switching signal component for controlling a magnitude of an LED current in said LED lighting module, and a low frequency pulse-width modulated switching signal component for controlling a duration of the LED current. - View Dependent Claims (3, 4, 5, 6)
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Specification