Patent ID: 9351354
Filing Date: 2016-05-24
CPC Classification: H02M,H05B,Y02B

Claim Text:
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 half bridge unit comprising a first and second switching element coupled in series between a high voltage node and a low voltage node and having a switch node between said first and second switching elements, a buck-boost input filter unit comprising a first inductor and a series diode coupled between a power input terminal and said half bridge unit, a buck output filter unit comprising a second inductor coupled between said half bridge unit and a power output terminal, an input decoupling capacitor coupled between the power input terminals, an output decoupling capacitor coupled between the power output terminals, wherein the output decoupling capacitor is in parallel with the load, and a control unit for controlling said switching elements, and an energy storage unit coupled between either a low power input terminal and said low voltage node of said half bridge unit, or a high power input terminal and said high voltage node of said half bridge unit; wherein the driver device is configured for zero voltage switching of the first and second switching elements.