Converter and method of operating a converter for supplying current to a light emitting means
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United States of America Patent
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Feb 27, 2018
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app pub date -
Sep 8, 2014
filing date -
Sep 6, 2013
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Abstract
A converter for supplying current to a light emitting means (8, 9), the converter (6, 7; 10; 90; 100) comprising: an input (11, 12) configured to receive a direct current supply voltage; 10 at least a first controllable switch (21; 41, 43) electrically connected between the input (11, 12) and an inductor (13), and a second controllable switch (22; 42, 44) electrically connected between the input (11, 12) and the inductor (13); a first diode (14) and a second diode (15) connected in series; a first capacitance (16) connected in parallel with the first diode (14) and a second capacitance (17) connected in parallel with the second diode (15); the inductor (13) having a terminal coupled to the at least one controllable switch (21, 22; 41-44) and another terminal coupled to an anode of the first diode (14) and a cathode of the second diode (15); and a control device (20) to control the first controllable switch (21; 41, 43) and the second controllable switch (22; 42, 44), wherein the control device (20) is configured to adjust a switching frequency of the first controllable switch (21; 41, 43) and of the second controllable switch (22; 42, 44) to set an output current of the converter (6, 7; 10; 90; 100).
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