Inductive decoupling-based multi-channel LED driver without electrolytic capacitors

Light-emitting diode (LED) drivers in outdoor street lighting applications suffer from short-lifetime because of the prolonged exposure to harsh environmental conditions such as high operating temperature, high humidity etc. A long-lifetime multi-channel LED driver consisting of front-end AC–DC boost power factor correction (PFC) converter followed by a DC–DC power conversion stage with dimming capability for LED-based street light is proposed in this study. This LED driver uses an inductor-based auxiliary decoupling circuit at the output of the AC–DC converter for mitigating the double-line-frequency power ripple present in the DC bus. The inductive ripple power storage circuit has a longer lifetime than a conventional capacitive storage circuit which is usually implemented by electrolytic capacitors. A digital control method is proposed to realise the decoupling control along with PFC control by a single non-digital signal processor micro-controller ST STM32F103RBT6. The proposed LED driver for street lighting is analysed and validated on a 150 W test setup. A comparison of active decoupling AC–DC converters for eliminating secondary-harmonic power ripple is displayed.

[1]  Jian Sun,et al.  On the Zero-Crossing Distortion in Single-Phase PFC Converters , 2004 .

[2]  Xinbo Ruan,et al.  A Flicker-Free Electrolytic Capacitor-Less AC–DC LED Driver , 2011, IEEE Transactions on Power Electronics.

[3]  Frede Blaabjerg,et al.  Reliability of Capacitors for DC-Link Applications in Power Electronic Converters—An Overview , 2014, IEEE Transactions on Industry Applications.

[4]  Haibing Hu,et al.  A Three-port Flyback for PV Microinverter Applications With Power Pulsation Decoupling Capability , 2012, IEEE Transactions on Power Electronics.

[5]  Frede Blaabjerg,et al.  Benchmark of AC and DC Active Power Decoupling Circuits for Second-Order Harmonic Mitigation in Kilowatt-Scale Single-Phase Inverters , 2016, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[6]  Haibing Hu,et al.  A Review of Power Decoupling Techniques for Microinverters With Three Different Decoupling Capacitor Locations in PV Systems , 2013, IEEE Transactions on Power Electronics.

[7]  Fei Wang,et al.  Flyback-Based Three-Port Topologies for Electrolytic Capacitor-Less LED Drivers , 2017, IEEE Transactions on Industrial Electronics.

[8]  Pritam Das,et al.  Novel High-Power Nonresonant Multichannel LED Driver , 2017, IEEE Transactions on Industrial Electronics.

[9]  D. Boroyevich,et al.  A high power density single phase PWM rectifier with active ripple energy storage , 2010, 2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  Javier Sebastian,et al.  High-Efficiency LED Driver Without Electrolytic Capacitor for Street Lighting , 2013 .

[11]  Mei Su,et al.  An Active Power-Decoupling Method for Single-Phase AC–DC Converters , 2014, IEEE Transactions on Industrial Informatics.

[12]  G. Kimura,et al.  DC ripple current reduction on a single-phase PWM voltage source rectifier , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[13]  Bangyin Liu,et al.  An Active Low-Frequency Ripple Control Method Based on the Virtual Capacitor Concept for BIPV Systems , 2014, IEEE Transactions on Power Electronics.

[14]  Frede Blaabjerg,et al.  A dual voltage control strategy for single-phase PWM converters with power decoupling function , 2015, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).