System using shunt circuits to selectively bypass open loads
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United States of America Patent
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Mar 22, 2016
Grant Date -
Feb 2, 2012
app pub date -
Jul 30, 2010
filing date -
Jul 30, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
According to an exemplary embodiment, a shunt circuit includes a floating shunt switch configured to bypass at least one load, for example at least one LED, among a plurality of series-connected loads, such as a plurality of series-connected LEDs in a lighting system, responsive to a high-side control signal. The at least one load has terminals connected across the shunt circuit. The shunt circuit further includes a high-voltage level-shift up circuit configured to shift a low-side control signal up to the high-side control signal using a voltage of at least one of the terminals of the at least one load. The floating shunt switch can be configured to bypass the at least one load responsive to a failure of the at least one load.
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