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2-Phase Input based 300W AC-DC LED Power Supply Based on LCC Topology

Fabrizio Di and Akshat
Fabrizio Di Franco, Technical Marketing Manager – Power & Energy, SRA System Research and Applications, STMicroelectronics; Akshat Jain, Staff Engineer, SRA System Research and Application, STMicroelectronics

In recent years, resonant converters have become more popular and are widely applied in various applications like server, telecom, lighting and consumer electronics. One key attractive characteristic is that a resonant converter can easily achieve high efficiency and allow high frequency operation with their intrinsic wide soft switching ranges. This paper highlight the 300W power supply featuring digital control of half bridge LCC resonant converter along with synchronous rectification.

The STEVAL–LLL009V1 shown in Figure 1, is a digitally controlled 300W power supply. The primary side constitutes of PFC and DC-DC power stage (half bridge LCC resonant converter) while the secondary side constitutes of synchronous rectification and STM32F334 microcontroller. The DC-DC power stage (half bridge LCC resonant converter) and output synchronous rectification are controlled digitally using STM32F334 microcontroller, while the power factor correction (PFC) stage works in transition mode based on L6562ATD.

The evaluation kit can either work in constant voltage (CV) mode or constant current (CC) mode as per requirement. The on-board fast protection circuits guarantee all essential protection features with high reliability. The performance of the evaluation kit developed has been evaluated under AC mains ranging from (270-480V) over the entire range of load. The power quality parameters are within the acceptable limits of harmonic standard IEC 61000-3-2.

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