Integrated Double Buck?Boost Converter as a High-Power-Factor Driver for Power-LED Lamps

The IDBB converter features just one controlled switch and two inductors and is able to supply a solid-state lamp from the mains providing high power factor and good efficiency. And with a careful design of the converter the filter capacitances can be made small enough so that film capacitors may be used. Thus the converter mean time between failures can be made as high as that of the solid-state lamp. The integrated double buck?boost (IDBB) converter will power-LED lamps from the ac mains providing high power factor, low LED current ripple and high efficiency. The operation of the converter is equivalent to two buck?boost converters in cascade, in which the controlled switch is shared by the two stages.