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SINGLE SWITCH DRIVER DEVICE HAVING LC FILTER, FOR DRIVING A LOAD, IN PARTICULAR AN LED UNIT

  • US 20140117868A1
  • Filed: 06/11/2012
  • Published: 05/01/2014
  • Est. Priority Date: 06/17/2011
  • Status: Active Grant
First Claim
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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, anda control unit for controlling said switching element, whereinsaid 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.

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