Journal ArticleDOI
Feed-Forward Scheme for an Electrolytic Capacitor-Less AC/DC LED Driver to Reduce Output Current Ripple
TLDR
In this article, a flicker-free electrolytic capacitor-less single-phase ac/dc light emitting diode (LED) driver is investigated, which is composed of a power-factor-correction (PFC) converter and a bidirectional converter.Abstract:
In order to achieve high-efficiency, high-power-factor, high-reliability, and low-cost, a flicker-free electrolytic capacitor-less single-phase ac/dc light emitting diode (LED) driver is investigated in this paper. This driver is composed of a power-factor-correction (PFC) converter and a bidirectional converter. The bidirectional converter is used to absorb the second harmonic component in the output current of the PFC converter, thus producing a pure dc output to drive the LEDs. The spectrum of the output capacitor voltage of the bidirectional converter is analyzed, indicating that the output capacitor voltage contains harmonic components at multiples of twice the line frequency apart from the dc component and second harmonic component. A feed-forward control scheme with a series of calculation operation is proposed to obtain the desired modulation signal, which contains the corresponding harmonic components, to ensure the bidirectional converter fully absorb the second harmonic current in the output of the PFC converter. Finally, a 33.6 W prototype is fabricated and tested in the lab, and the experiment results show that the proposed control scheme greatly reduces the ripple of the LED driving current.read more
Citations
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Journal ArticleDOI
Review of Active Power Decoupling Topologies in Single-Phase Systems
TL;DR: In this paper, the authors provide a comprehensive review of active power decoupling circuit topologies and their development laws from the view of the dual principle, switch sharing, and differential connection.
Journal ArticleDOI
Integration of an Active Filter and a Single-Phase AC/DC Converter With Reduced Capacitance Requirement and Component Count
TL;DR: In this paper, a concept of active filter integration for single-phase AC/DC converters is reported, which can provide simultaneous functions of power factor correction, DC voltage regulation, and active power decoupling for mitigating the lowfrequency DC voltage ripple, without an electrolytic capacitor and extra power switch.
Journal ArticleDOI
Benchmark of AC and DC Active Power Decoupling Circuits for Second-Order Harmonic Mitigation in Kilowatt-Scale Single-Phase Inverters
TL;DR: In this paper, a benchmark study of ac and dc active power decoupling (APD) circuits for the second-order harmonic mitigation in kilowatt-scale single-phase inverters is presented.
Journal ArticleDOI
Control Schemes for Reducing Second Harmonic Current in Two-Stage Single-Phase Converter: An Overview From DC-Bus Port-Impedance Characteristics
Li Zhang,Xinbo Ruan +1 more
TL;DR: Critical points for SHC reduction are summarized, indicating that, for reducing SHC in BVCC, proper control scheme needs be incorporated for increasing the dc-bus port-impedance at twice the input frequency and simultaneously, the loop gain should be high enough for eliminating theSHC in the dc source or load.
Journal ArticleDOI
Second-Harmonic Current Reduction for Two-Stage Inverter With Boost-Derived Front-End Converter: Control Schemes and Design Considerations
Li Zhang,Xinbo Ruan,Xiaoyong Ren +2 more
TL;DR: In this paper, a two-stage single-phase inverter with a boost-derived front-end converter was designed to reduce the second-harmonic current (SHC) by using virtual series impedance.
References
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Journal ArticleDOI
Means of Eliminating Electrolytic Capacitor in AC/DC Power Supplies for LED Lightings
TL;DR: In this paper, two methods of reducing the storage capacitance in the ac/dc power supplies for light emitting diode (LED) lighting were proposed to achieve a long power suppliespsila lifetime.
Journal ArticleDOI
A flicker-free electrolytic capacitor-less ac-dc LED driver
TL;DR: In this paper, a flick-free electrolytic capacitor-less single-phase ac-dc driver for LED lighting is proposed, which consists of an electrolytic capacitive-less PFC converter and a bidirectional converter, which serves to absorb the ac component of the pulsating current of the PFC converters.
Journal ArticleDOI
A Method of Reducing the Peak-to-Average Ratio of LED Current for Electrolytic Capacitor-Less AC–DC Drivers
TL;DR: In this paper, a flyback-based electrolytic capacitor-less light-emitting diode (LED) driver is proposed, which converts the commercial ac voltage to a pulsating current with twice the line frequency driving high-brightness LEDs.
Journal ArticleDOI
The Transition to Solid-State Lighting
TL;DR: A measure of cost-effectiveness for solid-state lighting in the context of other climate change abatement policies is provided, showing great promise as a source of efficient, affordable, color-balanced white light.
Journal ArticleDOI
Elimination of an Electrolytic Capacitor in AC/DC Light-Emitting Diode (LED) Driver With High Input Power Factor and Constant Output Current
Wu Chen,S. Y. Ron Hui +1 more
TL;DR: In this article, an ac/dc LED driver without electrolytic capacitor is studied and the operation principle, detailed design procedure of the main circuit, and control strategy are presented, and the feasibility of the proposed converter has been successfully verified by experiments.