Single switch driver device having LC filter for driving an LED unit

摘要

The present invention relates to a driver device (50a-50f) and a corresponding method for driving a load (22), in particular an LED unit comprising one or more LEDs (23). The proposed driver device comprises power input terminals (51, 52) for receiving a rectified supply voltage from an external power supply, power output terminals (53, 54) for providing a drive voltage and/or current for driving a load (22), a single stage power conversion unit (66a, 66b, 66c) coupled to the power input terminals (52) comprising a single switching element (60) and an energy storage element (Ch), both coupled to a switch node (55), wherein the power output terminals (53, 54) are represented by the output of said stage power conversion unit, a filter unit (68) coupled to said switch node (55), said filter unit comprising a filter inductor (Lc) and a filter capacitor (Cs), and a control unit (58) for controlling said switching element (60).

主权项

1. A driver device for driving an LED unit comprising one or more LEDs, said driver device comprising:
power input terminals for receiving a rectified supply voltage from an external power supply, power output terminals for providing a drive voltage and/or current for driving a load, a single stage power conversion unit coupled to the power input terminals comprising a single switching element and an energy storage element, both coupled to a switch node, wherein the power output terminals are represented by the output of said stage power conversion unit, a first inductor coupled between the switch node and a power input terminal, a filter unit coupled to said switch node, said filter unit comprising a filter inductor and a filter capacitor, and a control unit for controlling said switching element, wherein
said energy storage element is coupled between said switch node and an intermediate node,a second inductor is coupled between said intermediate node and a power output terminal, anda diode is coupled between said intermediate node and a power output terminal.