High-frequency LC3L resonant DC-DC converter for automotive LED driver applications

This paper presents a high-frequency zero-voltage switching (ZVS) resonant converter using a novel LC3L resonant tank. The converter behaves like a current source, with its dc output current independent of the output voltage. This property is favorable for LED driver applications, including automotive lighting. Furthermore, the converter exhibits minimal circulating current over its output voltage range. To reduce radio frequency interference, the converter is designed to operate at switching frequency above the AM frequency band. Experimental results are given for a 2 MHz LC3L converter prototype operating over an output voltage range of 3 V to 50 V while supplying a constant 0.5 A output current to a string of 1-to-15 LEDs. Using Silicon MOSFETs, the prototype achieves a peak efficiency of 89.5%, and maintains greater than 85% efficiency across a wide output voltage range.

[1]  F. Lee,et al.  LLC resonant converter for front end DC/DC conversion , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[2]  Khurram K. Afridi,et al.  High-frequency ZVS Ćuk converter for automotive LED driver applications using planar integrated magnetics , 2017, 2017 IEEE Applied Power Electronics Conference and Exposition (APEC).

[3]  Xu Yuzhen,et al.  A high efficiency integrated step-down Cuk and flyback converter for LED power driver , 2015, 2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia).

[4]  L. Capineri,et al.  A reduced output ripple step-up DC-DC converter for automotive LED lighting , 2017, 2017 13th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME).

[5]  Dianguo Xu,et al.  A Single-Stage LED Driver Based on Double LLC Resonant Tanks for Automobile Headlight With Digital Control , 2016, IEEE Transactions on Transportation Electrification.

[6]  Marco A. Dalla Costa,et al.  Comparison Among Power LEDs for Automotive Lighting Applications , 2008, 2008 IEEE Industry Applications Society Annual Meeting.

[7]  Charles Pollock,et al.  High Efficiency LED Power Supply , 2015, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[8]  Khurram K. Afridi,et al.  Automotive LED driver based on high frequency zero voltage switching integrated magnetics Ćuk converter , 2016, 2016 IEEE Energy Conversion Congress and Exposition (ECCE).

[9]  Giorgio Spiazzi,et al.  A high-frequency digitally controlled LED driver for automotive applications with fast dimming capabilities , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[10]  Li Wei,et al.  An efficiency-enhanced low dropout Linear HB LED driver for automotive application , 2008, 2008 IEEE International Conference on Electron Devices and Solid-State Circuits.

[11]  C. Adragna,et al.  Design-oriented steady-state analysis of LLC resonant converters based on FHA , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[12]  L. Fanucci,et al.  A Flexible LED Driver for Automotive Lighting Applications: IC Design and Experimental Characterization , 2012, IEEE Transactions on Power Electronics.

[13]  C. Tse,et al.  A Current Balancing Scheme With High Luminous Efficacy for High-Power LED Lighting , 2014, IEEE Transactions on Power Electronics.