Semi‐valley switching method for buck LED driver to increase its efficiency and performance

Buck-Boost LED Driver Using the PIC16F785 MCU

• The on-chip op amp of the PIC16F785 is used to amplify the voltage across the current sensing resistor. This allows a much smaller sensing resistor to be used and reduces power dissipation. • The PIC16HV785 device can be used, which eliminates the requirement for an external 5V regulator when operating from higher supply voltages. • This application has unused analog resources which could be ...

A Single-Stage LED Driver Based on Interleaved Buck-boost Circuit and LLC Resonant Converter

A single-stage LED driver based on interleaved buck-boost circuit and LLC resonant converter is proposed. The buck-boost circuit and LLC resonant converter are integrated by sharing switches, which can decrease the system cost and improve system efficiency. The input voltage of the buck-boost circuit is half of the rectified voltage, and two buckboost circuits are formed with the two half-bridg...

LED Driver Lifetime and Reliability

While LEDs themselves are extremely reliable and have a long lifetime, are electronic LED drivers capable of providing the required current/voltage input to the LEDs over their whole lifetime? This paper aims to address the above question in general and for the Xitanium family of LED drivers developed by Philips Lighting specifically. It will describe some of the strategies which Philips applie...

Membrane reactors: A way to increase efficiency

Analysis and Design of the 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-sta...