Electrical appliance having a lighting device having light emitting diodes
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United States of America Patent
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Jan 7, 2014
Grant Date -
Nov 3, 2011
app pub date -
May 2, 2011
filing date -
Apr 30, 2010
priority date (Note) -
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Abstract
An electrical appliance, particularly a television or a monitor, having a lighting device (8) having light emitting diodes (12). The light emitting diodes (LED) (12) are collected in LED strings (11) and controlled by a balancing network (17). The balancing network (17) has a circuit branch (19) for each string (11), the circuit branches (19) being connected in parallel to each other. Disposed in each circuit branch (19), is a bridge rectifier (20) to which the LED string (11) is connected. Moreover, each circuit branch has a balancing transformer (23), wherein all the secondary windings (26) of the balancing transformer (23) are connected in series in a closed conductor loop (27), by which the currents in all circuit branches are balanced.
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