Circuit arrangement for controlling LEDs, has control circuit supplying power dissipation signal for each power source circuit depending on power loss in power source circuits and producing control signal depending on dissipation signal

摘要

The arrangement has a switching converter (10) providing an output voltage (Vout) to an output connection, where the output voltage depends on a control signal (VR). Series connections of LED units (20) and power source circuits are connected with the output connection. A control circuit (30) supplies a power dissipation signal for each power source circuit depending on power loss in the power source circuits. The control circuit produces the control signal depending on the power dissipation signal. The LED units include light emitting diodes or series connection of two light emitting diodes.